Incredibly easy for a person without any experience. Tech Support is very good. I'd encourage anyone to buy the EZ Tune hardware and software. Spend the little $$$ extra $$$ for lifetime updates. They just updated the torque with Transmission for smoother shifting. I trust these guys.

The app works good for the most part. This is the second truck I've had it on. On both trucks the EGT readings began surging between 243 and 2000 even when the truck is off. To get it to reconnect after a firmware update, you have to unplug the module for 10 seconds and plug it back in.... The only problem is they tell you not to turn the key off or unplug it, but I have left it in my truck for over an hour trying to "restart".

The app overall is fairly easy to use and is decently laid out. However when I have the app up on any phone, several gauges will freeze and others will not. I have to exit the dashboard screen and then go back to it for them to work again. It happens consistently and it's very irritating to mess with driving. Please fix this.