I've literally just carried out the brake performance kit mod and for me it has immediately and completely transformed the pedal feel compared to stock and is so much more natural and progressive. So I can highly recommend it and wish I had done it many months ago when I first bought the V3s.
However, whilst taking everything apart and fitting the BPK is very quick and easy, getting the pedal assembly back together again is pretty fiddly and awkward and not necessarily as straightforward as the video above, or indeed Fanatec's own instructions, would indicate.
This is because the very thin cable that connects to the brake pedal's vibration motor, (which the video does not mention or show), runs in the same channel that the base of the brake pedal has to be pushed back in to before it's possible to re-seat the pin. (See around 1:55 in the vid) And when you are trying to do this under the heavier load, which the BPK introduces, it's a very tight fit and very easy to damage the cable because the base of the brake pedal is in constant contact with it whilst you are sliding the base back in to position. And there is no warning about this anywhere.
I managed to avoid any damage by placing two 2.5mm Allen keys in to the channel, (in parallel), to act as rails / risers and as suggested in post #6 of the topic I've linked below. This allowed the base of the pedal to ride up and over the top of the cable to avoid crushing / pinching / breaking it. Once the pin holes were more or less lined up at each end, I then used a bigger Allen key as a lever inside the pin-hole, to make the final, tiny adjustment needed before I could push the fixing pin through. (Although this might not be required if everything lines up perfectly in the first place)
http://www.racedepartment.com/threa...e-performance-kit-installation-issues.142859/
So if you do go down this route, go careful and take your time.