My reaction to the found tech Beemers is that they don't impress me much.
BLR-2C & BLR-3M: Whoop-de-do, we have gained some range on the PPC.
BLR-3S: Oh great, another non-jumper giving away range by using MPLs. Anemic firepower outside six hexes.
BLR-4L: Now, this one has some potential, especially as a long-range annoyance. Not great, but usable.
BLR-4S: OK, this one is a decent upgrade of the original. Still, only decent.
BLR-5M: Finally a variant combining the durability of a SFE with an acceptable level of long-range firepower. (4L & 4S both use light engines.)
BLR-6X: XXL Large engine, and it costs how much? Probably one of the most expensive mechs in existence.
BLR-10S/10S2: Fail. 3/5 and short-range specialization does not work on todays battlefield.
BLR-CM: Well, it is one of the few dual C3 master mechs.
BLR-K3: A bit too hot running, but it can contribute at all ranges.
BLR-K4: Situational. A nightmare when it has cover, but is hurt badly by open terrain.
BLR-M3: OK, this one is decent.
C: Honestly, I liked the Corsair's toy better. Its saving grace is that Clan mediums has more range. Still, needing Clan-tech to be a good mech says much.
So, some of them are decent enough, but in the end, the ones I would be interested in fielding are:
- If needing C3Masters: CM, K3 & M3.
- As a generalist: 4L & 5M.
- In single scenarios set in cities/forests: K4.
- Acceptable if they come up in a RAT/as salvage: 2C, 3M, 4S, C.
- Sell and buy something better: 3S, 6X, 10S, 10S2.