I have built a couple of BYOC kits, the TS808 and Phaser 90 and the Small Stone. this was when you could get them direct from the States to the UK and was cheap option.
My tube screamer is built to TS808 spec, better suited to driving valve amps due to output impedance change from the TS9 spec. Its also spec'ed to do Symetrical (original TS) and Asymetrical Clipping (SD-1). I have also swapped out the 1uf electroylic for some metal film caps. The result is a great sounding boutique pedal that I use as a booster.
The Phase 90 is pretty good too, but sounded a bit bassy for my liking, but I fixed it by adding an input buffer. Also BYOC supplied JRC741 op amps which give unity gain. Units that use the Texas 741 or others have slightly more gain and therefore the unit has a slight boost, which I don't like.
The Small Stone is a nice chorus to which I have added the Cap switch option.
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The other build site which is pretty good is Tonepad
http://www.tonepad.com/They give the schematics and supply circuit boards to populate yourself. All the way from Chile, South America
I have built their CE-2 , Small Clone, Tremulus Lune, MXR Micro amp and Ross Compressor. All these cicuits work fine. With component upgrades these units give the "real thing" a run for their money PLUS they are True bypass.
My pedal board is populated with home build pedals and they prove to be robust, reliable and tone worthy.
Pedal chain
Budda Wah with Vocal mod (switchable by switch under treadle)
Phase 90 Script version (which is just minus a 22K feedback resistor)
TS808 with all the main mods
Small Stone chorus with cap switching mod
MXR Micro Amp
Boss DD-5
Boss TU-2
