RDS-3A Red Shift - It is a kind of obvious version, good, but does not really stand out.
LDT-X3 Brigand - Pirates mounting an XL engine? Sorry, I am not convinced. Also, the rule is "pillage, then burn", so I rather would have MGs to prevent the loot from burning.
LDT-X4 Brigand - Same problem with expensive light engine as above. Also, it pays too much BV for the TSM.
ABS-4C Anubis - It was kind of expected that someone would make this sooner or later. My only complaint is that it does not have room for alternate ammo types.
OSR-5D Osiris - As a mech, I like it. As the concept of turning a mech of one type, into a wholly different concept I dislike the idea.
RZK-10S Razorback - I like the concept, a lot. However, the compromises taken for it are a little too much for my taste.
RZK-10T Razorback - Looks like Bowie Industries want compete for the Hollander market share with this one.
GUR-6G Gurkha - A mid-range version of the Gurkha, nice, but does not really stand out.
GUR-8G Gurkha - I do not like that the version that finally got TSM replaces the Sword with a Retractable Blade.
STO-3C Stiletto - Combining the Streaks and the LRM into a MML launcher, to make room for dual ERMLs is a good idea. However, removing the ECM for making room for alternate ammo types, is a bit more non-obvious, so I am curious about exactly what type of alternate ammo the designers aimed for?
CMA-2K Chimera - Better than the GUR-8G, this design makes good sense.
SYU-6B Sha Yu - OK, it has snubbies, but it still runs hot.
B3-HND Bloodhound - Overkill against infantry, a bit too weak against mechs. I would rather replace one or two of those ER Flamers with more lasers.
BLF-40 Blue Flame - This mech makes the case of using LPPCs over ERLLs. The tarcomp does also reduce the minimum range issue. It is a design that at first glance does not stand out a special, but is quite clever in a low-key way.
HSN-10G Hellspawn - Nice side-grade. Very good as a complement to the ordinary version.
HSN-10SR Hellspawn - I would use a dedicated scout design, rather than doing a complete refit of a rare fire-support design.
TSN-C3M Tessen - Makes sense.
UZL-8S Uziel - It sure is a great mech, the problem is that there is so little common between this one and the rest of the variants. So, why is it called Uziel, and why is it not its own mech, instead of a variant?
CNS-TD9 Cronus - A madman's mech. Still, it is amusing, and there is method in the madness.
LGH-7W Lightray - I am not convinced about the MML on this design, especially since the price you pay is an XL gyro. I would rather have had a 6W with a snubbie.
AGS-5D Argus - Decent. I cannot really make myself sound enthusiastic about another HPPC mech.
AGS-6F Argus - Decent. I am a bit curious about how common it is. AC/20s are not all that popular in the Suns after all.
NJT-4 Ninja-To - Great design. Mix this in a lance with Grand Dragons.
VR6-C Verfolger - LB 10-X or 2xMML 9?, that is the question. It is really a good alternative to the original, while still maintaining its flavor.
VR6-T Verfolger - Now this one is interesting. Is it the first mech to mix a snubbie and a LPL? It keeps a lot of options for picking the engagement range, due to being very effective from 9 hexes inward.
NDA-3S No-Dachi - The 2KO got the No-Dachi right. This one improves the concept, adding an ECM suite and the madness that is
an TSM enhanced mace. 36 points of damage!
WHF-3C White Flame - This one has to be new due to the Plasma Rifle and HD gyro, even if it is missing from the OP's list. The Plasma Rifle variant makes good sense. I would rather have removed the AMS, than reduce the armor. The original had maxed armor, so the AMS made sense on it.
WHF-4C White Flame - Well, this is the snubbie variant, not much to say about it. It makes sense to mount the TAG on the version with the snubbie, since good stand-off range is useful on a priority target.
LHU-3L Lao Hu - RAC and Plasma Rifle is an interesting combo. Another first?
LHU-4E Lao Hu - Evil. It is head neutral as long as you do not fire the Rocket Launchers.
P1E Perseus - Wastes too much on one-shot stuff.
P1P Perseus - It is clearly made for closing in to close range. Still, I am not really happy with it. Too many questionable choices (MRM without C3, ERSLs) due to a desire to match the art.
P1W Perseus - Well, this one has at least enough ammo for the LB 20-X.
TNS-4T Thanatos - Throws away what made the Thanatos stand out, to turn it into just another Victor copy.
TNS-6S Thanatos - It can at least jump far enough. Still, I would have preferred if it had a 5/8/5 movement profile.
LGC-03 Legacy - Another Jihad era design, that is missing in the OP. Dual HPPCs, yawn. Predictable, decent, boring.
LGC-04-WVR Legacy - The name, oh please. Naming a mech after an unkillable comic-book character. As a mech I guess that the Legacy Wankerine is decent.
LGC-05 Legacy - No, just no. It wastes too much tonnage on sub-optimal choices. I suppose that it is intended to be a command mech, due to the focus on keeping mechs from coming too close, and improved survival.
TLR1-OD Templar - It is an interesting idea, that might just be worthwhile.
TLR1-OE Templar - A decent combo of C3 master and fire support.
TLR1-OF Templar - Why put a LGR on a config intended for broken terrain?
TLR1-OG Templar - A real extreme long-range fire support. Combine this one with a snubbie C3 spotter at range 7.
TLR1-OH Templar - Well, it is deadly if you have a C3 spotter in place, or you manages to close in. (I dislike the range brackets on the MRM more than the +1 to hit.)
TLR1-OI Templar - OK, it has managed to put three 15 point guns on a 85 ton chassis, which is a good achievement, and makes for a deadly mech.
AKU-2X Akuma - A more focused and polished version of the original.
AKU-2XK Akuma - Not bad either.
SGT-9D Sagittaire - Yes, it is easy to see that it is a Davion mech. More versatile than the original.
SGT-10X Sagittaire - I have hinted at it before, but now it is time to say it out: I am not impressed by the Medium VSPL, at all.
FNR-5WB Fafnir - Interesting.
FNR-6U Fafnir - Too much changes to turn it into a King-Crab wannabe. It would have been better if it followed the pattern of the rest of the Fafnir versions.
VQR-7U Vanquisher - Ah yes, a 100-ton scout mech. See the WoB fail at being Lyran.
VQR-7V Vanquisher - I guess that it works as a mid-range brawler.
