I fully agree. 16X DVD burning has not reached maturity, and 16X DVD+R and DVD-R media are not yet widespread, so more time is needed for improvements in both drives and media (though MCC004 appear to be well made).
However, this doesn't mean one cannot be conservative and go "underspeed". For example, limit burn speed to 8X on 16X-capable drives, or limit burn speed to 8X or 12X on 16X-rated media. It's always the state-of-the-art (16X DVD burning) technology that's on the "bleeding" edge with the most problems.
I bought a PX-716A recently, despite having read all the postings of poor 16X burns, mainly because I highly value the analytical tests available with the PX-716A, such as Q-Check PI/PO, FE/TE, TA, etc. If you don't plan on doing much or any media scanning after burning, I believe the PX-716A is not your best choice, as there are many other lower cost burners that do very decent jobs with a wide variety of media at 4X and 8X.