I just finished building Kevin's UCD400-2 kit and wanted to share my experiences. I can't say enough about how happy I am with it! My electronics experience is limited to some basic stuff when I was a kid, so I'm basically a total newbie. Regardless, the kit could not have been easier to build. I honestly don't think it took me more than 3-4 hours total (in 3 separate sessions). The instructions were very clear and, now that I'm done, I think the internals are really beautiful! The kit is very well designed so it's easy to make everything neat and clean and pretty.
Even more important is that the sound is awesome! I'm really pleased. I have it hooked up to some Dynaudio S3.4 speakers right now (direct from a squeezebox SB3) and I honestly think it's the best sounding amp I have ever owned. I was planning on modding the kit to be full dual mono eventually, but at this point I'm so happy with how it sounds that I don't see the need. If there are any newbies out there with questions about the kit I'd be happy to take a shot at answering them.
Lanier
Kit Details: AD opamp option with dedicated supply mod and the UCD HG power supply.