This tuner, once you call tech support and get them to upload several files for your vehicle, works well for the most part.
I was able to shut off MDS in my Chrysler and upload a 91 octane tune which allowed the car to perform quite nicely.
I say not user-friendly because you cannot stop a tune or review in progress, as it will cause the car's PCM to get stuck in whatever mode it was in when you disconnect the tuner, and the risk of damaging the PCM could be a possibility.
User beware! View more reviews...