I had this since September. It is a fight every time I try to load a tune or return to stock then try to reload a tune. I have done everything from a factory reset to updating the firmware and deleting the app to restoring my iPad. Always the same story. I get a failed to setup accessory message 9 out of 10 times. Then all of a sudden it works, and will stay working till the next time I go to use it. Could never get it to work on my iPhone 5 for whatever reason. Only works sometimes on my iPad 3. Thankfully I have both or I would have had to return it. Then when you finally get it to work, the app is horrible and needs updating. The gauges are cut off on the iPad and the keyboard fails to open when you need to type in the app, like vehicle weight or name a custom tune. Please pay attention here SCT and fix this stuff!

The app works. The tunes transfer and what not but this thing is old, outdated, slow, ugly, buggy and sometimes doesn't work. I don't regret purchasing but i do with that this thing i paid so much for would be kept up. Needs more tuning options, advanced options and better less buggy dataloging. 3/5 due to insustainability.

You must update the dongle's firmware or you will not be able to change the car's ecu program. After I updated this app, I was no longer able to return the car's ecu back to stock. It would error out. After multiple try's of trouble shooting with SCT tech, they remotely accessed my laptop, with the dongle plugged in using the USB cord, and updated the firmware and some other files. All good now and works perfectly. As of now, it does not say on the app update that you must download the dongle firmware but since they are having so many tech calls, they are going to add it soon. I figured I let you guys know. I suggest updating both. Works awesome.

Purchased the iTSX because it's supposed to work through your iPhone instead of needing a PC to upload your tunes.The app will not allow you to save a custom tune from an email to the app. I tried restarting and uninstalling and reinstalling the app. Nothing. All it does is open the app. I do not get the option to save the file. When I reached out to the company I purchased the product from he said if that doesn't work I'd need to plug the iTSX to my windows computer to upload the file. I only own Mac's and this defeats the purpose of my paying more for this device over the other, cheaper model.