Better than an external one on my legs that I had one time, which hurt quite a bit in the trigger points near my groin. They were running behind, so I went back 15 minutes before my follow-up appointment with my GYN. I'm in her waiting room now to get the results.
This morning, I woke up about 5:30 and thought, heh, I'll stay up, go to work early, etc. Then I moved, and was in very bad pain (about an 8 1/2) and laid back down. I woke up at 8:11 and had to call my boss and explain that I'd be a little late. The pain is a little better, so long as I don't move much.
Okay, I'm back in the room now, so I should go. I'll update later.