OK, so I was looking for a gismo, small enough to be able to carry it with me all the time (along with my 12" laptop and my guitar) for playing and recording my stuff.
It's small, that's for sure.
Soundwise, I prefer clean and semi-clean sounds. Was I impressed? Not really, but at least I was able to dial a satisfactory clean sound (with just a tad reverb, no other effects) and that did the trick. Not infinite options but I am sure a lot of people will like some of the available distorted sounds as well.
I was impressed with it's USB recording capabilities though, again that's a big thing to me so I am keeping the little bugger no matter what.
I downloaded both the Mighty Amp app (official Android app) and the Mightier Amp app (excellent 3rd party Android app) and it was easy to access all the available options to shape the sound, save presets etc.
Also, it was very straight forward to update it with the latest firmware.
I tested it with a pair of Sony mdr-zx110 headphones (24 Ohm), AKG K240 (55 ohm) and Sennheiser HD600 (300 ohm). I do NOT recommend using anything with more than 55 ohm with the Mighty Plug as the overal volume will be too low and there is no way to compensate it. There are a few tricks, like pumping the IR volume by a few dbs, maximise the amp volume etc. but be aware it will start clipping after a certain point. For my needs and for maximum portability the Sony mdr-zx110's will do the trick.
The included USB cable is too short so be aware if you want to use it for recording. Just buy a good quality 1.5-2m cable.
I can't comment on battery life, not yet anyway.
All in all, for my needs it's fine, especially for recordings while I am on the road and the portability is superb. Anyone is looking for more sounds, adjusting capabilities etc. should look away but it's worth for the price,