100% flawless operation on my Apple Macbook Pro when connected to my old Mitsubshi Diamond Plus CRT monitor.
I needed a mini displayport to VGA converter to connect my Macbook Pro to my monitor, which only has VGA connectivity. Initially, I bought Apple's version of this adapter as I figured that it would probably work better, being of the same brand and presumably designed and tested to work with the Macbook. However, I found that with the Apple version connected, the monitor would flicker and go blank quite often. I had noticed on the internet that Apple's adapter was known to exhibit this problem in some cases and that Apple had issued a firmware update for it to correct the known problem. I tried that update and it reported that my monitor wasn't supported so it would not perform the update. This may have fixed it for other uses with different monitors, of course.
The other problem with the Apple version was that the design prevented the thread of the thumbscrews on my VGA monitor cable from being screwed in to secure it to the adapter. While the cable didn't fall out, it would not have been robust to movement and if I had been using it in a projector environment for example, the cable could have easily come unseated.
So, I sent the Apple one back (Amazon refunded without a problem) and bought this Startech version (also through Amazon) based on the good reviews on this site. It performs 100% flawlessly on the Macbook Pro with my monitor (so far). Furthermore, the design allows the VGA cable thumbscrews to work as designed to hold the VGA cable in place. OK, it's not as pretty as Apple's sleek white version, but it's not ugly, works perfectly and is of a better functional design than the Apple version.