Feature:
I already have a good clean tone . I wanted this to add the tube feel to a ss amp. With these tubes it just can't get true clean, even with gain on zero. It is built very well with metal housing and jacks.

Quality:
road worthy.

Value:
Half the price of others.

Desirability:
Fully adjustable tube dist. for my solid state amp. Nice.

Sound:
I bought 2 and they both have inferior tubes. They barely light up and take 5 mins. to warm up to where there's no static. It muddies your clean tone and there is no touch sensitivity. The distortion is fantastic. Noise gate and EQ are great.

Ease of Use:
It takes some adjusting to dail in.

Support:
Have not called yet.

Overall:
This is worth the extra 10 bucks for a new tube. Maybe yours will have a good one. I am going to try a 12au7 for more clean. I am keeping both of mine.

Overall:
I bought it a while ago and it sounds great to me, but beware: this is most likely of the "starved plate" category of tube drivers, running at a low voltage. Google that if you don't know what I mean. Other tube drivers like the Seymour Duncan have circuits that really utilize the tubes, but those were too expensive for me. I went ahead and bought an Electro Harmonix 12AX7 tube after hearing that the behringer tubes are unreliable and sound bad, but personally I liked the stock behringer tube better than the Sovtek (behringer was softer sounding with less high gain) I could definately hear a difference, which means the tube can't be completely for show. Overall, to my relatively untrained ear this pedal sounds great and gives me what I think is a nice tubey sound, and I'm glad I bought it since my solid state amp's OD can't compare.