I came from a "professional tuner" to this. After all hardware installation, I was willing to get the software done. After data loading and sending to mountune via the mTune app, they replied within minutes with the files. Can't be easier doing the readout, data loading, connection test and you just have it in front of your eyes, your files are there. Installation is super easy and after loading m260 software the results are amazing. It is great how it pulls. I feel a huge difference on development behind the tune, there's no fake peak power on mid-range rpm to make it feel powerful. Delivers power smooth and brutal at the same time. It makes you feel confident flattering out just after you have done the first test drive. And it scares you if you don't really expect such a great power deliver. At the same time it is just as smooth as stock if you want to. Just amazing. I have not installed the upgraded filter box which I'll get soon the carbon open cone filter, but the intake piping in silicone and aluminium and mountune air filter I have installed. In addition to that I've got mountune throttle body and gfb dv+ valve upgrade and no failure at all. It works perfectly.
Been running at m260 for a month or so with all the recommended hardware and high body throttle. For me I feel like there is a slight difference but not as big of a difference everyone makes out. Yes it is a lot quicker and drinks more fuel but do question whether is it all worth it
The performance gains are exactly as Mountune state, and the installation process is super simple, just follow the prompts and you can't go wrong. Highly recommend.