Are the NEC drivers USB 3.0?
So far I have had good luck with the ASMedia drivers. I haven't tried an external HD enclosure as yet but have used a low cost USB 3 to SATA device to run any external drive and it works just fine. Just a bit sloppy looking and really only for temporary usage.
I am looking for a real enclosure but will definetely will stay away from the WD Mybook after all the negative reviews I have read.