Here is a sound text of the Joyo Ultimate Drive being played through a Marshall Plexi reissue 1987x and a JCM800 cabinet loaded with Celestion G12-65 speakers. I'm using a little reverb in this video and nothing else. The guitar being used here is a brand new 2012 Gibson Les Paul Standard.
Many people claim that the Joyo Ultimate Drive sounds very much like the OCD Fulltone. You can make up your own mind after hearing the demo.