I built the OTS for James Lum, an LA session player. He is the touring lead guitarist for James Ingram (RB artist) and has used the OTS on studio sessions in recent months with good reviews. Although it took some time (the controls are very interactive and require a lot of tweaking),once the sweet spots are dialed in, the amp is an absolute wonder. The clean tones are outstanding and the overdrive is…well, I don’t think it gets better than Dumble style overdrive. The effect loop is marginal though, so Jim is after me to build a Dumbleator clone for him.