Does the job, provides a sturdy frame for 2 2.5" drives. Comes with screws and manuals. Can't ask for much more.
My only gripe is that the screw holes are of a thinner thread, which I believe is the sort used on 2.5" drives. Where as 3.5" drives use the wider (larger pitch, as it's known) thread. This isn't normally a problem, as they provide suitable screws. However my case, Antec P180, uses rubber gromets to hold the hard drives in place, and so I can't affix them properly, as they need special screws, which only come in the larger thread size. So unless I can find the same type of screws in smaller thread, I can only bodge it with random thin thread screws that mean it is loose and hangs about inside.
I don't know why they didn't use the same thread size as standard 3.5" drives, for compatibility.