after posting I was looking again to find some kind of information backing up my claim. Could not find any :-( I might have mistaken merten and moeller.
However, using a proprietary RF technology instead of a proven available one is kind of stupid in my book.
Sadly, this is the way almost all major companies are working... I once had a visit from representatives of one of major producers of kitchen appliances... They looked at Pluto and they were impressed, BUT they said ("somewhere between the lines") that system is too "easy" (in different meanings, for instance "anyone can provide support") to make money out of that... When comes to such levels, plain logic is pretty "economically" twisted :-( ....
But guess what will happen - in a year or two, they will design their own "look alike" system with proprietary technologies. This world really sucks... But at the end, WE CONSUMERS, buy such things and let them make profit out of that...