I replaced my laptop hd with a 750GB WD Black. It's a very fast drive and has a 5 year warranty. I've tested it with quite a few tools such as hdtune and about half a dozen others. It seems a good bit slower than what people were getting in testing when they initially reviewed the drives. They showed some pretty impressive screenshots. But it's still a blazer of a drive and I doubt that would be grounds for returning it anyway.
One thing it does is, whenever I am in Linux on either one of my usb stick installs or the LMDE on the HD itself, it makes a horrendous clicking sound, loud as a thump almost. It doesn't do it in windows at all. Apparently it is a known problem with most people saying it is harmless. I think it is parking the heads or something. I have also done S.M.A.R.T. tests with quite a few tools and everything appears fine so far, though I am keeping an eye on it. It does seem to be a specifically Linux issue and it does it with all different flavours I've tried so far.
But the thing only cost me 60 quid. It was the largest/fastest 2.5" drive I could find for the money at the time. I'll tolerate the clicking and the slightly lower than specced speed. Doing audio on it with large channel count throughput on multiple tracks. It's a superb drive for the cash.
As for this new hybrid WD drive - no thanks. The paranoid bastards that make audio software (like their stuff isn't cracked black and blue already) make you go through a full re-authorisation which dependent on software can be anything from mildly irritating to full on you have to be kidding me jumping through circus hoops that take five days of emailing fucking customer support. There are quite a few cases where a lot of the audio software people don't make you do that, to be fair. But I have a silly amount of software and it all adds up. And everything paid for in full. I even buy software I haven't installed yet to 'support' the devs.
So the hassle with two drives in one would at first glance just be double trouble. It takes days to re-authorise everything already. I wouldn't want to risk the nightmare with this new one. I like the idea of it though. If not the price.