I've given a few of the new units some testing. A few thoughts (hardly comprehensive):
Eyrie: Nastier than it looks at a glance. Quick, agile, harasses at long ranges but closes fast to deliver wicked laser and ATM fire- and the talons are an unexpected finishing move. Very impressive design- not perfect, but very useful, particularly when it has fire support from...
Gyrfalcon: It's like the old Rifleman is reborn, but with incredible range, great mobility, and heat dissipation. So, nothing like the Rifleman, I guess. Still, hitting with four guns past 24 hexes, that's pretty serious stuff- and able to keep hopping backwards to hold the range, no less.
Jade Hawk: Like the Eyrie on steroids. Hard to think of a design to compare it to- it's more like the Tazmanian Devil from cartoons. Get close and just start whirling death in all directions. Needs support or broken terrain to be effective, but very nasty if it can get close.
Shrike: In many ways the least impressive of the new 'big four'. Works a lot like the old Executioner actually- jumps further, lacks the headcapper (seriously guys, Ultra-5s?), but remarkably cool-running. Tough cookies for sure- great command unit for a Star.
Hel: HUGE fan. Surprise. All three models have been fun, but the B (yes, the Hel-B, screw you) in particular has been fun to use. Battle armor are a bigger threat in the Dark Age than ever before- what better way to tell them to go away than a howitzer round or two?
Thor II: Tough to argue with an upgrade to my favorite all-time Mech. But, in true Thor fashion, some configurations make strange pod choices. When it's on, it's a marvel. When it isn't... it's as frustrating as its predecessor can be.
Jupiter: Beef. Just... beef. Again with the Ultra-5s, but with four of them chattering you can forgive it a little. Hits hard at long ranges, but runs awfully warm- tough to make brackets when all eight weapons are long range oriented. I'm biased in favor of the Jup-3, but it's a great machine for chattering away with a hell of a ballistic punch.
Thunderbolt IIC: ...I want to like this. But it just runs too hot- those lasers are too much, replacing them with ERs would help a ton. But the Streak rack is nice, for sure. Sadly, one of the worst minis in a long time. :-\