I've had this installed for about two weeks now on my 150ps non s/s.
They installed it in around 45mins and showed how to "remove" along with some provided goodies.
Performance wise, the car was only a month old to me anyway (4k miles), but I did and do feel a difference, even idle noise seems slightly up, but may me by imagination. Car definitely has more umpfh, most noticeably to me in 2/3/4th (because I use them most!). Spinning in 2nd and 3rd is now much easier than before, a result no doubt of the extra power.
In eco mode there does seem to be a good gain to be had, although I have only used this a couple of times, reverting to performance mode as soon as someone annoys me.
One thing I've used less now is the sports mode button, which I suppose is a testament to the extra power, as the car feels like a different beast now using sports mode combined with any TDI mode.
For general motorway overtaking in 5th and 6th you also feel the difference, you may find yourself not changing down gear at all whereas before you may of decided to.
I have the bluetooth simple to be able to change on the fly.
Overall very happy, able to surprise most cars out there with it's performance and lack of visible exhaust pipes, but get some really good mileage if in eco stage 1.
Being lighter than the 200ps but having semi comparable power is great, I can only imagine what fun them guys have tuning to 250 and the likes. Although beware the S/S 200 (and probably S/S 150) has the weaker gearbox and depending on your tune, may put it over its rated torque limit.
Company was great.