They are good, except that 750 gig PATA disks are expensive and rather old, so it isn't worth the money.
On the other hand, the controllers will support drives up to 2 TB. I tested drives using IDE-SATA adapters and they worked fine. I even upgraded an XRAID from 500 gig disks to new 1 TB 2.5" SATA drives for a client because they did not have the money for a new chassis and it's been running fine for a couple of years now.