I got to try the new Husky 575. It was a ported 575 (EHP) and cut really nice through the 16 inch beech. I couldn't bog it down. It could certainly handle a more aggresive chain and/or bigger wood. The Dolmar 7900s (muffler mod only-Sedanman or ported by EHP) were a hoot to cut with: light, powerful and fast. The smaller saws like the Stihl 361 (EHP) or the Husky 359 (EHP) just scream through the wood. They were great fun to cut with.
Most of the chains on these saws wouldn't stand up to a full day's work. Several had cutters that were so small you could probably cover the entire cutter with one (1) sesame seed. I'm talking tiny, tiny cutters with the backs, fronts and undersides all ground away, giant gullets, and little stubs for rackers.
A good ear for what the saw is doing is very valuable. Ed did a cut with one of Joker's saws ( a 372 I think) and said it was too lean. A half turn with the screwdriver on the H jet and he picked up over a second in the cut, going from something like 7.7 seconds down to 6.6 seconds.
The belly bar on Sedanman's 7900 looks cool and the saw actually seemed to cut a bit faster with that bar on it versus a standard bar. I cut with it and it has a cool feel going through the wood.
I think the EHP361 had a fairly standard looking chain on it compared to the EHP 359 with a hogged out race chain and the 361 beat the 359. It's a bit apples to oranges comparison, but there may be more to the motor winning the race than the chain. Maybe that's what Macman101 said in another thread about having a chain race at the next GTG?