I did have plenty to complain about until finally getting my firmware to update, now it's really only one main gripe...
I'm using a hardware only setup and if I use an alternating (forward then back) sequence mode, it's out of sync after less than 16 bars. In fact, it's even out of sync with it's own drum sequencer! Anyone else experiencing this or prepared to try it to confirm I'm not going nuts?
BTW, I had lots of sync issues with looper/roller and general out of sync problems before updating firmware. +1 to whoever said to wait before pressing ok: this should definitely be added to the tutorial.