Yeah they have the abbreviation of SATA-E I believe and I looked something up on them off the WD site but I too didn't find anything incredibly out of the ordinary.
Here's an article regarding it:
I'd say just go for the non-enterprise version.
BTW: I've bought from zipzoomfly a hundred times, I infact suggested it to Alex. They offer really good service and if anything is wrong they do a goob job of getting it replaced.
They use UPS though which I find usually sucks compared to FedEX, so I've noticed with newegg I generally get the package a day early whereas with UPS it'll be there probably around 5pm on the day it's due...one time they didn't come until 10pm.
Anywho, hope that info helps ya