I installed this in a speaker cab to drive a 12" Celestion Greenback G12H and I'm (surprisingly) pleased with the sound, especially considering I'm comparing it with a valve amp, so I'd definitely recommend it - and very good value for the price too.
On the design side some have commented on the volume knob position, and I'd change two things: firstly, as others have pointed out, the speaker lead wires are way too short, and probably should be terminated in a simple connection block anyway; secondly a very small thing but two of the mounting holes are badly positioned making screwdriver access tricky, especially in a confined space like inside a cab...that's picky btw!
That's it - good stuff Thomann, thanks for making kit like this available and at a really good price too.