Still testing this amp but first impressions are it is almost exactly what my daughter needs for busking. There are a number of YouTube demos and reviews, make sure you watch those too. Impressive that so much can be got from just 8 AA batteries - quality appear solid and most of the modelled amps are useful - though 'crunch' seems a little useless for my daughters uses - also she would prefer a system that allows boosted channels of any of the voices to be saved, and to be able to access these via the footswitch - my understanding is that it's only possible to turn reverb and chorus on and off with the basic footswitch that is compatible with the amp - i.e. there's no way of creating a lead boost of any of the modelled amps for solo use - for this it looks like you need to use a separate pedal board with a boost pedal and play your board's effects through the amp's clean channel. The CUBE iPad app is good, but a few more features, like the ability to control channel volumes, and guitar volumes, instead of just the volume of the backing track when playing live, would have been good - as would have been a more ecconomical carrying case!
UPDATE - after 8 months the amp has developed a fault on the main power switch - seems like a loose connection / solder, power cuts intermittently and without warning, also power switch often doesn't turn on power unless the whole unit is tilted forward. Contact Thomann and awaiting return details from Customer Services Dept.