Best thing about Seagate drives (never thought I'd type THAT!) is that it's Firmware level, block duplication, with (afaik) read-ahead.
Lets say he has an album he plays EVERY DAY when he gets home from work, but is a serial offender of the "Skip the last minute, I know how this song ends".
Well the SSHD will only cache the blocks he plays most often, it doesn't care about WHOLE files.
Isn't that neat?!
For the tiny cost difference (at least, on the 1TB drive), there's no reason to avoid them.
Ah neat, very neat.