So after reading a few comments and giving it a try myself for a little bit...
Assaults will be absolutely f-ing devastating. I tried some nice broken builds and they worked nicely.
I do like some of the extra sweet points they have thrown in but they will be nasty e.g. reduced spread on weapons and reduced heat gen. Magazine size is nice but I dont see anything broken from it.
Cost of 9.1 mill to level a mech. Currently if you added the modules on blank mech, normally that's radar derp + seismic + two weapon modules (6+6+3+3 = 18million). Ok you have saved half for one mech. Problem is... in the old system you could save money buy swapping your investments (very annoying and could have been easily fixed, but no). Logically the latter made sense, you are equipping the mech. Proposed system, you "skill" up your radar derp, eh?!
I want to build mechs not build skills. This is a system for other games. The skills I am building for Assault mechs is pretty damn nasty. Tanking up and improving the weapons.
Personally I dont have time to grind and I know I am not the only one so if this game turns into one, I am completely out. Not because I want to get out, it's cause I just don't have the time. I shouldn't be punished into spending MC's just cut insane corners.
The XP values to level a mech as opposed to before just don't add up. Forget all the refunds and think ahead, you will purchase a new mech which will be crap (no skill points), stuck trying to level a lemon for AGES, then get fed up and stick to something that works.
Respeccing is just silly. Previous system there's only benefits, now there's barely any benefits and lots of negatives.
It's going to take me quite some time to replicate this onto all the mechs, they should allow a template and allow you to modify it without costs.
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Overall you have to realise you will now to have keep similar weapon types just to adjust to the tree benefits, this means a serious re-jig on most of my mechs
And you'll have to buy all the variants if you want variety, unless you can bother to keep respeccing.
I prefer the older system IMO. Less grinder, more straight forward even if you lose the nice weapon buffs.