I bought a 2nd Premier (with lifetime) during the current Fast-Forward sale and eventually I want to upgrade the drive but I have several questions. Should I upgrade the drive as soon as I receive the unit or confirm the refurb works for about 30 days and/or wait until the warranty expires. Not sure how reliable the refurbs are. Also, I've read a lot of pros/cons between the WD EURS, EARX and other drives. What appears to be the most reliable for TP right now? Thank you in advance for the support/feedback.