Save yourself the headache and stay away from Ericsson. I have the Z520A. Not a cheap phone. It's not that it's of poor quality, or bad reception. It's just very stupidly designed. It's like they had monkeys come up with the interface. For example, the side up and down buttons don't control volume like you'd think. When you press them, they give you the phone information (i.e. the model number of the phone). So to change ringer volume, you have to actually go through the menus (when there is a perfectly logical button for it--though used in an incredibly illogical way).
Also, there is button lag. What is button lag? You press a button, and the phone takes 2 seconds to respond. Hit menu, 2 seconds later, the menu pops up.
Annoying little shit this phone is!
Oh, to answer the original question, my buddy had the razr, had a lot of problems with it, and had it replaced. Still has problems with it (the new one).