I just played a game with a:
-Atlas III (HAG version)
-Black Knight -5H
-Centurion -O
-Gunsmith
versus a Kuritan force composed of a:
-Hitotsume Kozo -1F
-Rokurokubi -4T
-Shiro -1V (3/4 pilot)
-Tenshi -O
My thoughts on the new hardware:
The Atlas III is brutal. It's hyper-accurate, forcing PSRs at any range (we were playing with the +1PSR every 20 points of damage, so it was even devastating). It's bloody unkillable too, with that standard engine and CASE II.
The -5H Black Knight was, by far, the MVP of the match. I threw the shield into active mode from the get-go and its ability to block the 5-point Light PPC, LAC/5 and LRM hits as it closed was amazing. Eventually the shield got blasted apart, but not before stopping HUGE amounts of damage. The left-side of the 'Mech ended up melting off, but all that additional weaponry on the right side of the 'Mech let me keep blasting away. It reaaaally made me want to try the Atlas III with the dual shields. Too bad we're still missing some rules for that one.
The Gunsmith was also a work of art. It's blindingly fast, and quad accurate 6-point hits in the rear arc of any 'Mech I wanted (or added to the damage of the Atlas III/Black Knight to guarantee a difficult PSR) was pure pleasure. It was untouchable for most of the game, and only became chewy after failing a 3+ MASC roll and critting a few leg-things. Then the Reflective armor let it shrug off 2 full alphas from the Hitotsume Kozo before dying. Definitely a nice 'Mech.
On the Kuritan side of things, I was thoroughly unimpressed by the Hitotsume Kozo. The Rokurokubi and (especially) the Shiro are both amazingly tough mothers (I was in shock after the Rokurokubi survived a full-damage alpha from the Atlas III, with barely anything going internal), although that hardened armor makes them very vulnerable to any sort of PSR. They're also a bit lack-luster in the firepower department, that's for sure.