Re: Mesa Express 5:25
i own a 5:50 and i can tell you that it has plenty of volume for gigs. it can drive a cabinet without breaking a sweat.
the 5:25 with the extension cabinet should be able to handle small gigs, but i don't know if it will do the job on its own. when i tried it, i cranked it to about 8 and it was pretty ****ed loud. i have to say though that it was only like 4-5 on my 5:50 which is much louder.
i think you should be ok with teh extension cab though. the amp is truly great sounding and for the price gives you several different tones. there's a crunch channel that i really like, the blues channel, and the burn channel. each one has a different voicing and they actually sound quite different. the clean channel is immaculate. the crunch channel has a squashier bottom end and sounds very suitable for dirty blues and classic rock. the blues channel does just that, but with a tube screamer, you can get some real eric johnson tones. the burn channel is tighter on the bottom end and has a bit more gain than the crunch channel.
the amp does get a little muddy in the bottom end though and has a lot of bass response, so you're going to have to tweak it a little. if you're going to play a gig with the 5:25, you will need to turn the mids all the way up to cut through because the mesas are a bit scooped sounding as it is.
also, the 5 watt channel is very nice and louder than you might think. it's got a sweeter character to it and you'll have to re-eq everything when using it in that mode.
i decided to go with the 5:50 because it was so much louder, but i really liked the sound of the el84s in the 5:25. i wish the 5:50 had el34s so it would sound more like the 5:25, but it has its own great sound quality.
the construction quality is excellent and they're not heavy amps. good luck man.