Was a little annoyed at first seeing this deal, just bought the refurb on sell-out for $520 a few days ago, but looking at the details, happier with that one for what I'll be using it for.
My last experience with HP was a work laptop, I got it used and beat up already, it ran for 3+ more years with me, then the controller for the CD drive died. My work replaced the chassis and I used that one for several months without issue. I forget the model though.
Overall I think the machine lasted well, given my work involved extensive air travel, and it had seen more miles in its life than most.
Made sure to get the SquareTrade warranty on the refurb I got from sell-out though, given that it will NOT be replaced at the drop of a hat like my work machine if/when it bites the dust ;)