I used it with a Vox Tonelab, before I got the KPA. It did the job well, was loud enough along with a loud drummer. Fairly clean til you push it hard, than it adds some own distortion. I then went for an Engl Preamp with external fx, using the poweramp I suggested above. That was somewhat the next level. I like my fx stereo, so these days it wouldn't be an option for me. Nevertheless, if one is on a budget and space is a criteria, I can recommend it for sure.
Speaking of, I currently have an ENGL E530 preamp myself, I was originally planning on getting the ISP Stealth Pro and running that with the Kemper on my 2x12 since it can do stereo with a switch above the inputs. It's only about £50 more than the Ultra Light. I have heard that the EH power amp pedals add distortion, that's kind of one of the reasons I ended up never getting one, I don't know how good solid state poweramp distortion sounds if good at all.