think you miss read it paws, sshd's (solid state hybrid drive.) are not the same as a typical ssd (solid state drive.), they have both the platters of a normal hdd (hard disk drive.) and a small amount of ssd cache storage, personally i wouldn't touch them, i'd either go for a hd or ssd depending on needs and budget.
can't remember why i wouldn't touch a sshd, but think it must be either because i read they had poor performance in certain situations or because i read of some reliability issues somewhere, all i know for definite though is for me personally it's either a hd or ssd and sshd's never come into the equation, to me the benefits they offer are not worth the higher cost than a normal hd or the lower cost of a faster ssd.
that's just my opinion though and other users may find a sshd the perfect drive for them, far as i'm aware the reliability and lifespan are supposed to be comparable to any other drive despite the niggling doubt i have in the back of my mind about sshd for some unknown reason.