Go for it man, it's my favorite amp by far, and I have tried quite a few amps.
For live playing mic'ed or not it's my go to amp, if I'm just noodling at home I like my mesa.
The most popular upgrades are a celestion G12h30 and JJ tubes, Eurotubes have retube packages for 3 different gains...I picked the Blues package with higher headroom. The speaker and tube swap make a world of difference when you crank the little beast. I also installed a Fan with its own power cord(this amp will eat power tubes if you play out alot).
The bad stuff:
The reverb is not great...just good enough.
The drive channel sounds good, but only for medium to low volume...ex: you have the clean vol. on 4, you will need to crank the gain channle to 12 to get a vol. boost:zzz:
The boost button when used sounds worse than bad
The tubes are unprotected on some models, they can be yanked out easy if you rush things.
The whole thing rattles and shakes under the mighty power of the lowend on this amp ( does not bother me in a band situation).
No standby switch.
I love my C30 and will never sell it. For playing with a band I usualy have the clean channle on 3.5 or 4 to get a smooth break up with a boost/overdive in front of it(any type of tube screamer will give you a nice fat boost) this is loud enough for most clubs.
If you go louder on the clean channel, like 6 or 7 it sounds just like the drive channel, rendering the drive channel useless, vol. 7 on the clean lets you use your guitar's volume for boosts incase your pedal is screwed, you just wont be able to get a fat boost, the amp is bright at that volume, the tubes are cooking and so is the speaker:rockon2:
IMO it's a true good'un regardless of price point.