I'm glad you are impressed with the speed of the WD Black drives. I myself have 2 640GB Black drives and a WD Velociraptor 300GB drive.
But to be brutally honest with you, none of them hold a candle to my Crucial 128GB M4 and my Crucial 240GB M500 SSD drives.
I've sold several dozen SSD drives at my work over the last couple of years and have not had a single failure yet.
We've also sold several dozen Black edition drives and had at least a dozen or more fail.
As long as you go with a reputable vendor such as Crucial, Samsung, Plextor, or Corsair, the failure rate is substantially lower than a mechanical drive.
Nobody has to convince anyone with a brain re the speed of SSDs. I KNOW.
But I am not going there yet. Pls honor and accept that. If I still used my laptop, I would upgrade it with an SDD. But I never use it; I use this desktop inside and my phone outside, and all possible bases are covered.
I also plan to stick with my internal backup strategy, wherein I do new clones form the drive I mainly boot into to my backup drive around once a week. I have zero interest in having my OS on an SDD and most other things on a backup drive. As it is my boot time with this drive is around 30 seconds. In every way, it is as fast as I could want.
Yes indeed, I not only know Blacks (as do all drives, now, more than ever) fail, some almost immeidately, I knew it in detial re the specific drive I am in right now, before I chose this model and submitted my Best Offer price for one I felt was The One.