I really dig the 'Bird since I tend to ride a bit beyond what the 5.7 is really intended for. I haven't been on my Phoenix in a really long time though (knee surgery will do that for ya!). I have been finding myself spending a TON of time on the M4X, more than the Firebird actually. It's such a cool bike. And then I get on the Point for a few days....
I really wish Adult Swim would go for another season. BTW, how do you like your flaming chicken? I've got a 5.7 and a Phoenix, but if I had to stick to one bike it seems like the Firebird is about as close to a do everything bike as you can get.