Yeah, I had a Keeley SD-1 before, sold it off, and missed it. But for the money, I couldn't resist the Allums mod, like $24 for the GT mod kit. It sounds great, like a boutique pedal. It's a keeper. What made it so attractive was the SD-1 can be had for a penny and a dance. I got one off the bay for $22. I'd like to try the BD-2 H20 mod but it's alot more moola used. So I just built a BYOC OD2 and it sounds nice. I think I like it better than the Allums SD-1.