Don't know about the 2 NAS boxes, but you already have the drives, so why ask if they are good now? Should have asked 2 weeks ago eh?
They are so-so, nothing special. Although the hitachi stuff from what I remember were bought from IBMs drive business which became really tarnished after a whole series of their deskstar drives were failing like mad. They were actually nicknamed "Deathstars" due to their tendancy to die. I would go with Samsung, then WD, then Seagate, then Hitachi myself. But since you already have the drives, unless you buy new ones, you have what you have.