Especially as, if it doesn't rate the media as good, it may not even hit the 52x - or even the 48x.
Unless you are going to do error rate testing, overriding the smart-?? maximum speed for a given media is unwise - in fact, taking it down a notch or 2 may be beneficial (or do nothing at all, or even make it worse).
On a full burn, with good media, haw many seconds does it actually save?