I've had time to explore my completed OSD, and I'm really happy with how it turned out. After completing the build, I only had one bad solder joint to fix, and then everything worked. There are a lot of sounds available with the mid-boost/jazz-rock/bright switches, Right now I like the switches set to rock, mid-boost on, and bright off. All the tone controls interact with each other, and with the tone switches, so I'm still exploring all the possibilities. The OD channel sounds great - very smooth and touch sensitive. The noise is pretty low even with master up over half way, and hum is very low.
All of the components in the kit are very high quality. I'm using the recommended tubes now, but I'm planning to experiment with 5881 tubes soon, to see how they effect the sound.
For anyone planning to build one of these, I would suggest practicing wiring and soldering skills on something less complex first... The builder's guide has tons of useful information, but it really helps to read ahead before working on a section - and get comfortable with reading the schematic and especially the layout diagram. I found I really had to make sure that each connection has all of the wires/components installed before soldering - it's harder to try and add another wire after filling up an eyelet with solder. Trying to melt the solder and stick in another wire is kinda tricky. Having a solder sucker helps.
I would say it took me about ~30 hours of work to complete, but I was taking my time and trying not to rush. A very enjoyable build.
Ken