We were able to connect via Bluetooth to our Spirit XT285 treadmill with no issues. However, the incline levels don’t change according to your incline level or at all for that matter. The only reading that appears to be accurate is mph, time and heart rate. You can not physically change any treadmill settings from the app so if that is something that you are looking for…maybe this app isn’t for you. If this app functioned and at least accurately depicted the information on my treadmill, I would probably give it a 5 star rating. Hopefully this issue is being addressed because if not, it is pretty useless for tracking and sharing info with Apple Health App therefore my wife and I will be deleting in the near future.