Several things come up with my first read through of the book. (Still going through SBF and Inner Sphere in Flames/At War): For one, the tables for the Alternate Era Weapons and Equipment are smack dab in the middle of the book, contrary to how CGL has previously established such material. Not a huge deal breaker, but very awkward. Secondly, as part of the AEW&E, the book has the WoB Super Jump, but not the Interconnectedness Unlimited Super Jump. Oversight, or is the IU Drive merely a one off deal that won't be covered? Even so, I'd prefer to have the IU drive as an option outside of an ISP book.
Next: LAMs. Holy bejeezus, figure out what you want to do. I can understand not giving AirMechs obscene TMMs, and I applaud it. But you're going too far the other way with these nerfs. I'd prefer the base mod be +2, with the AOO modifier added on to that, to make the whole thing competitive but not insanely overmatched. Next is the TH mods that you get in AirMech mode. +3 for Cruise and +4 for flank are, IMO, far too much. +2/+3 would be fine if you wanted to make it difficult for 4/5 pilots to actually hit anything, but good friggin luck with a +4 TH as a regular pilot before movement mods. +1/+2 is probably on the kinder end, but might be a little too nice to LAMs.
RISC Gear: Wot. Most of it is either okay (The ECS and the Super Cooled Myomer), is bad (Hyper Lasers, Laser Pulse Modules), with the Repeating TSEMP being an atrociously bad outlier, APDS being a solid piece, and the Viral Jammer. More on that one by its lonesome. But overall, these feel like designs that left the drawing board too early. Nothing over the top, just merely meh.
Viral Jammer: Holy shit guys come on. The VJ may actually be the most broken piece of gear I've actually ever used. It almost makes LAMs in their prime see slightly balanced. Yes you have to choose what type of Jamming you're putting out, but for 19 points more than a Clan LPL, I can slaughter electronics. The 17 hex radius is nothing to sneeze at either. The weight of 2.5 tons means I can take old C3i mechs, or even GECM mechs with a spare medium laser. And 12 heat is literally nothing. I'd also recommend a PSR to reactivate the affected equipment, otherwise I could just make a pair of 600 BV 12/18 hovers to scoot in and jam the living hell out of c3 and stealth systems for an entire game for less than the price of a modern heavy mech.