I've been amazed by the quality per cubic inch (and per watt) of the Blackstar Fly! 170mm x 126mm x 102mm - it really looks like it's shrunk in the wash but at 0.9kg it's heavy enough for its size to spark a bit of confidence it's more than a novelty toy. 2 channels (clean and overdrive), ISF, Tape Delay fx, MP3/Line In, Emulated speaker out / Headphones. Battery Powered or optional power supply. That power supply is the only negative - very pricey as an add on unless you go for the Fly 3 pack which has an additional "cab" and Power Supply included. The basic Fly 3 is just £50. £80 for the Fly 3 Pack. Seems like it's £25 for the optional Power Supply - so the pack seemed best value - ramps things up to a massive 6 watts(!) and gives stereo sound if using the mp3 input. Slightly smaller than the relatively small Fender SuperChamp XD amp I usually useand makes the guitar look like a giant! I'm not going to suggest it sounds as good as a "real" amp which would be looney. But put up against the competition of other mini amps - the Fly leaves them trailing in its wake. There are YouTube videos around that confirm that. It's not tube, but it is quite dynamic and it does have an element of responding to the player easing off and digging in. I'm not the best person to demo this sort of thing but here's some melodic style lead with the PRS SE (P90s) played through the Fly, with a David Wallimann Backing Track ("Dreamy"). On the overdrive channel with low level gain for some gentle break up. Recorded in a rush, one take, and using a condenser microphone (ought to use dynamic recording an amp probably) - didn't footer about with mic positioning. No EQ shaping or fx used in the recording software. "The First Dreamy Fly of Spring"