I got to try a 200 and a 192 last week, both set up with a Sioux dime tip bar and 1/4 pitch chain. The 200 was a carving machine, the 192 just so-so. I love the rapid acceleration and throttle control of the 200. The 192 just felt doggy by comparison. The sluggish throttle response would get real tedious when furring or feathering I'd think. Nice and light, though, less vibes as well.
I also got to see a 339 XP with the same bar and chain setup. The guy plunged horizontally into the end of a pine log with only his trigger finger on the back and one finger holding the front handle up. Tons of power for a small saw, but it feels more like a light blocking saw than a detail saw, even with a dime tip on it. It feels well balanced, but that extra weight just wouldn't make me excited about a little extra power.
I just got a Redmax 3200 (7.5 pounds) for detail work, but I'm gonna get a 200 as soon as I have the money, I love that saw. The 339 just wouldn't fit in anywhere for me. The 200 has power throughout the RPM range, so I see no reason to burn it out by running it WOT when using just the tip. I think I could get almost everything done with just a 200 after the major blocking is done. The Redmax is for when I get better with the detailing, it is one smooth running saw.