Others say...

"Great quality - hard to label"
I haven't had a bad CD in the bunch yet, and the black color is very classy looking. However, since the entire CD is black, there's no place to write a label! As everyone knows, sticking a label on a CD is a bad idea because it unbalances the rotation of the CD and there's a chance that the label will come off inside the player, so that's not an option.

They've left an area for a label - all they have to do is make it a color that a permanent marker can be read from.

"Quality is sub-par; lack of writing surface"
I've used these discs for both standard PC data media (burnt ISOs for backups and general data), for CD/Redbook audio, and for some grey-market consoles (select people will know what I mean by this. :) )

Out of a 50 pack, I ended up with about 6 coasters. Not horrible, but not great either.

These discs have a tendancy to be "noisy" when read from -- the thickness and size of the discs, despite being standard, must be off by a slight margin since they end up rattling around inside of drives at higher speeds (32x+). Other vendor's discs don't seem to do this.

These discs do not perform very well under high speed operations (32x+) either; lots and lots of media re-reads. Again, other vendor's discs seem to perform OK.

But the worst part, in my opinion, is that there's no writing surface on the label side of the disc! It's almost completely (99%) black. How are you supposed to write on the disc what the contents are?! Oh right, there's a 1cm strip along the edge of the CD (curved none the less) where you can write. Thus you're forced to buy stickers that go on the disc (which end up making the discs unbalanced in weight, thus making even more noise than mentioned above).

I'd have given these discs 3 stars had the quality been better, but the lack-of area to write on is appalling. I really don't know what Memorex was thinking.

"Perfect so far"
I usually have problems with Memorex CD-Rs, I've even had one spindle where every other cd was bad. But I've been through about 5 of these Black 50-packs and haven't had one CD-R fail yet. These are the only kind I'll use for my business. Very good product.

"burned almost 100 without error"
I am converting a personal library of LP's & 45's to CD's and have burned almost 100 CD's to date and have yet to have a single problem. I label them using Memorex labels and haven't experienced any blistering. I use the CD's for archiving, as I play the music on my iPod, but always listen to the CD's after they have been burnt to ensure they are OK. I rely upon reviews when making purchases and thought, in light of the bad ones for this product, that I needed to add my experiences.

"well...not what I thought"
When I saw these I thought they were the old one's that Memmorex used to sell. Memorex used to be a really good brand for media, but their CD-Rs just keep getting flimsier and flimsier. I got these because the old black labels were really thick and lasted a long time. They also held up great to scratching. The new ones are cheap and the top often peals off which is even worse then a scratch on the bottom. These seem to be as flimsy and cheap as the regular ones except black. I would now choose a different media such as TDK, but unfortunately my old car stereo only prefers Memorex for some reason.
The last 100pk spindle of Memorex CD-Rs I got werent black but seem the same. Almost everyone has the top peeling or flaking off somewhere eventhough they were kept in a case most of the time. And again, when the top peels off it seems to be much worse than a scratch (Data is completely lost). Too bad a great brand turned to crap.