Big discounts, money back and free accessory offers all sound good, but what happens if the phone stops working? Are you going to be able to get another Z520? I doubt it.
What are you going to do with all of the accessories you purchased?
The Z520 although a pretty solid phone has had its share of problems; mostly associated with a faulty main display. Many customers have complained of white lines showing up across the screen after only a couple days of use. This is an obvious defect and unfortunately there is no quick fix.
I would always recommend staying away from cell phones that are nearing their ?End of Life? status. They may seem like a good deal, but it may wind up costing you more money in the end.