Hi guys, I have a mint SMS1 for sale. It's a great unit, but when I ran the initial tone, the curve surprisingly was almost flat. There was a small hump that the SMS1 is currently correcting at 60Hz, but I just can't justify it. In any case, it works exactly as advertised and extremely easy. I'm just blessed with a good room and strategically located treatments. Asking 525 + shipping. Let me know if you have and questions. Paypal please add 3%. Pics available upon request.