Form Factor is best feature
Brilliant form factor. I can mount it in a rack on stage and put my guitar amp underneath . One rack, amp on topand still have room for a rack drawer with all my mics and cables in the rack. The unit sits out too much so I had to move my rack rails back a couple of inches so that the rack cover would not crunch the knobs. Not a big deal.
Now that not-as-good part. It's fine at low volumes, but it's not really what I call clean sounding. Has that Behringer tweaky, rough edge sound characteristic of cheap amps. I question the power rating since I had to max the output of my smartphone to hear an mp3 played through the unit....Even with the Behringer at full volume it was loud enough to talk over the mp3.
BUT is still great for small gigs where you have to haul equipment by yourself. Or, you could just make it part of your permanent setup and just use it to drive small monitors. It takes a feed from another mixer if you like.
I would not use it for miking kick drums no matter what speakers you have. It will distort.
Effects are certainly adequate. Pick a handful and memorize the numbers since there is no manual. No problem I found a decent slap. reverb, chorus, and some flangy stuff. I foot switch for the effect would be a really useful addition, as would a true stereo input.
Overall it didn't sound any better than I though it would, but it didn't sound worse either...It will do the job for me, but I won't be using it to power a gym or outdoor gig. Small rooms, soft drummers, some nice reverb and it's a winner.