^ i haven't owned one, but I've tried one several times. I'll get the ball rolling, but obviously listen more to the guys who actually own one.
1) it has plenty of gain. perhaps more than a recto, in terms of pure gain. the rectos, though, have a lot of lower mids, which tend to make it sound "heavy", without the need for as much gain- the engls are a bit brighter in tone- think megadeth tone, as opposed to mesa, which is more of a modern metallica tone.
2) it's a compromise. not as much as you'd expect, since each channel is voiced individually, but there's not doubt, there's a little compromise there.
I'd look into a genz benz el diablo too (in addition to the screamer, and perhaps a mesa f30), they're all roughly in similar price bands. of course, if you can't get to try them...
:drink: