I have a WT800 (USA) head and absolutely love it. As stated above, it's a lovely warm sound with a valvey creaminess to it. EQ is excellent and detailed but tbh, it sounds great with everything at 12 o'clock. It's a heavy beast though so doesn't get used all of the time. I reckon it's the best sounding amp I've had along with my Weber Mywatt which is top quality, all valve and hand wired.