These cryptic comments bashing Memorex products are all well and good - but no one has even inquired as to what media is actually being discussed here. As we all know, Memorex does not actually manufacture media - they sell media made by oem suppliers under their brand name. Just like so many other brand names.
jon, I suggest you identify the actual manufacturers code of the Memorex media you are using. You can do this with DVDInfo. Then, look up that exact media (by internal code number) on videohelp.com to see what experiences others are having. That combined with your personal experiences with the media on your system can guide you on whether to use these in your burner, or use them following some of the other "constructive suggestions" made in this thread.
For example, it could very well be that this Memorex media is actually CMC media. Mentioning CMC media in this forum will most likely get you a fresh series of critical comments. I'm not disagreeing with some of those criticisms. But I generally do ok with CMC media packaged under the TDK brand name in my Benq 1620. You need to make up your own mind about media, focusing on the actual manufacturer id.
By the way, I NEVER burn any media at the highest rated speed. I would be burning your 16x media in my 16x burner at 8x maximum. I might even burn it at 4x if any problems develop. The burn speed can impact the readability of the burned media in your player, especially towards the end/outer rim of the media since the burn speed tends to be at its maximum there. If there are problems, it can show up as video artifacts (tiling, hesitations, etc.) or actual lockups when playing. And burned media can deteriorate over time. It may burn and play just fine initially, and then deterioriate over time. I understand this has to do with the type and quality of the dye used in the media, as well as how and where it has been stored (ie. leaving them lying around the front seat or dashboard of a car is hazardous to the health of optical media).