Thanks for bringing this up JDEN.
In short, I don't buy it.
It should be noted though that this was developed specifically for magicians and the project was headed by Paul Harris in conjunction with guys like Richard Turner and Garrett Thomas.
A couple of things, briefly...
a) The USPCC didn't want to modify their Rider Back design... Hence they stopped allowing gaffs to be produced under the Rider Back design... So, they decide instead to, wait for it... Modify their Rider Back design! So that all the magicians of the world can rejoice and... Modify their Mandolin Back design! The whole thing seems a little absurd to me, not least of all because the modifications are fairly minor...
b) The reason Bikes are so popular: they're cheap and common. How many stores will stock a deck basically made for magicians, for cheap? And even if the design has been changed only a little, it takes away the commonness of using Rider Backs (incidentally, I don't actually mind personally, but just throwing this out there...).
However, to throw this out there, too...
c) I've never believed in the argument that using decks different from the standard (Rider backs) created suspicion. It depends. A 12 year old using a "cool" black deck would look stupid, and may arouse suspicion. Someone with perhaps a Goth look would be right at home with those. So, having said that - any outlet for gaffs is good, right? If it floats your boat...
So all in all... Don't really care for them either way. See what happens, not fussed. They may catch on, they may not. Phoenix decks may catch on for all we know.
One final thought...
d) The Ultra Mental (aka Invisible) Deck, etc., are being produced in Mandolins as well, apparently - but these do not require any modification of the backs at all...