After many an in-store shoot-out, I bought the Fulltone OCD to go with my Texas Red Blues Jr. SRV would be jealous. At last great blues tone from a metalhead. Along the way I tried the normal TS9 Tube screamer, The turbo screamer (not as good suprisingly) and lots of others. Never tried a keely mod--couldnt find one local but they sound good online. The OCD sounds incredible and FAR better than youtube demos. Even just used as a clean boost it gives that little bit of edge and sustain the amp needs. Awesome.