Pros: light, great battery life
Cons: no frills
This phone is a little old now, but still works great. It's super light and has great battery life. I popped my sim in it and used it on a backcountry hiking trip (vs taking my nicer phone) and it worked great.
It is as basic as they get, but works great for making/receiving calls. If your looking for the latest technology, this is not the phone for you. If you have bad vision and want big buttons, this is not the phone for you.
I've had 2 of these phones now and got both off ebay for next to nothing (sold the first when i switched carriers, didn't break), so I'd consider them good buys.