I have had 2 eBay car chargers for my Nextel 7520. Both fail after a while. Is the "official" RIM charger from Nextel worth the $29???

I used this one from Nextel for the 7510, 7520, and my 7100I. Its outlasted 4 of the BB's.

I bought the ebay versions, too. They don't work, especially if you paid $3 apiece like I did. Edge Cellular was decent and said they would refund my money, but it would have cost me more to send them back than I paid. The short of it is... You get what you pay for. My $3 batteries lasted about a week. The car chargers seemed to wipe out my profiles I had created. Didn't hurt anything, but I had to do a hard reset and replace the profiles. You will never regret buying the best (made for it stuff). you could severely regret buying the very cheap stuff.