Yes. I use it almost every gig. Natual attenuation is said to be about 10% according to Soldano himself, and it's enough to push my amp into the sweet spot without being too loud. I've only tried the mic out once to my PC, but haven't messed with it that much but am anxious to try it in a live situation. I can only compare my Jettenuator experience to a Marshall Powerbrake, and I don't experience near the discoloring of tone/blanket over speaker effect on the Jettenuator like I did with the PowerBrake.
What specifically do you want to know about it?