I had been running the Edge Hot J/A for 7 or 8 months without any problems. As soon as the Smarty came out I put it on my truck. Seperately they work flawlessly, but as a stack not so great. The settings don't seem to really matter. Under acceleration it works well, pulls hard smokes pretty good and makes my clutch beg for mercy. But at steady throttle there is a noticeable surge. I don't know if it is hurting anything, but I certainly don't like it. I almost never run them togather anymore unless I want to get moving in a quick hurry or smoke out some punk.
I have read that the Edge works off the stock computer programing, and since the Smarty reprograms the computer, the stack will not work all that well togather. I'm personally thinking about sending my Edge down the river and getting a TST. The only thing holding me back aside from the cost is that I love the Attitude display. To replace it with analog guages would be both costly and time consuming.