The biggest problem (even on examples without the issues shown here) is with the grip safety. You have to hold the pistol in an unnatural way to engage it. This means that (1) accuracy will suffer greatly and (2) in a moment of duress I wouldn't count on the gun actually firing. Very disappointing.
Maybe my hands are just different from yours. I have no issues with grip safeties on 1911 models. Of the handguns I've personally used I would say that the XDS functions the best for me - in that I don't even notice it's there.
The grip safety on the R51 reminds me most of the one found also on the FN Model 1910/1922 pistols.
This is why professional hockey players are great role models and generally good human beings. Do you want your kids idolizing someone like the St. Louis Blues' Backes, or someone like Dennis Rodman, Aaron Hernandez, or A-Rod? #NHL#StLouisBlues