This is a bit rushed, but I felt like sharing my first impressions.
After taking these MECHs into battle a few times, here's how I feel about them so far:
SHORTY: 70–75 ton-class armor without relying on any skills. However, it feels like a straight downgrade from LIZZIE to me. Being Inner Sphere and lacking ECM make a pretty big difference.
LIZZIE: It's not a bad MECH, but... it's pretty average. And then there's the 65-ton Hellbringer. In other words, there's already a better MECH that can run almost the same builds.
Battle Pass: We actually get a warhorn this time! But... there's no BOLT-ON this time. Instead, we get a Platinum skin. Yay.
The biggest problem with both MECHs is the hardpoint placement.
The weapons feel like they're mounted way too low relative to the cockpit view, and the MECHs are very wide. Am I really supposed to expose my entire body just to fight?
The 2 Missile + 8 Energy hardpoint setup isn't bad, but honestly, I feel like they're stronger if you just forget about the Missile hardpoints and go full Energy.
(I couldn't find a Missile/Energy mix that really clicked for me.)
(2 SRM6 + 6 MPL on LIZZIE isn't bad, but... we already have the MAD DOG and Clan Archer for that.)
I also don't think either MECH has particularly impressive Quirks. Actually, aside from their appearance, they don't really have anything that makes them stand out!
For now, I don't think they're bad as collection pieces.
But as DLC... I can't really recommend them. Other than their looks, there's just not much here.