I had to use the german Version and
downgraded (better: switched) to 1.1 US as soon as I heard of customization...and couldn't find out any difference between both FWs.
The Loss of guarantee and the possibility of a brick for newbees is probably the only reason to stick to the original FW.
However, the advantage of PRS+ is worth the risk!!!
Correction:
downgraded (better: switched)