Me and Kiwi both have very similar amps - mine is a 'noname' 800w digital stereo 1u poweramp and kiwis is 1200w I think. You can get them from the states via eBay and the voltage is switchable. Mine is really shallow, like a rack tuner. Amazing bit of kit, full, strong sound and very cheap. Mine was £90 second hand and I think Kiwi paid about £150 all in. I will get a link later as I can't use eBay at work.
I wouldn't have any worries trying the Thomann one, probably very similar internally to much more expensive ones. Well worth a try, I think. If anything, the Thomman one seems expensive in comparison!