N.Kaos here from Deadbeats MO...On advice given in a post from Jock of GBH who has used this for their recent American tour, I got this as my Marshall dsl100hr is away getting repaired... It's tiny, about the size and weight as a margarine tub... it has a handy switch at the back to adjust the ohm setting to 4 , 8 or 16. .. so 50w at 4ohm... 25w at 8 and 12.5 at 16 i presume. My 4 x 12 cab is 8 ohm, wired classic and celestian speakers... As an aside.. I've been using a Rolland Cube 60 as backup and currently that the Marshall is away.. as it can connect to the 4 x 12.. i Will say its the best moddler I've tried especially for taking pedals but.. the mids suffer.. and as I'm the singer as well this can be frustrating... not being able to hear my guitar cut through the mix and unable to hover by my cab.. you know? This little amp though.. wow... the first time in actually asking myself is it worth hauling around a Marshall head. And you'd fit it in a jacket pocket. Volume wise it's loud... we do some local gigs in rock bars where the house p.a. is reserved for vocals only.. so totally reliant on the backline (and no stage monitors) i wouldn't hesitate to use this amp for such a situation and of course for bigger gigs everything is miked up so no issue. And we're a punk band so loud as the proverbial.. 5 stars for sure..