I have one Pieb, had it for a couple years.
LOTS of built in effects, too many for me, but that's me..
Good sound from the headphones and a great tuner built in.
The on-board phrase sampling kinda sucks.
The built in beats are decent with a couple I would say are good.
Tweaking is easy once you get the hang of it.
It is not a "quiet" device. Something that has always bothered me somewhat.
Ie; regardless of running on battery or AC adapator, as soon as it become active there is a distinct elctronic noise constant present.
Having said that, I don't regret mine.