I bought this phone wanting a backup for my main phone as it has a tendency to run out of battery very quickly.
As a backup, it's not bad. It's fairly small and light, the battery lasts a lifetime compared with my main phone, and it's very easy to use. It's also very nice for texting, the buttons are comfortable to use and well spaced. The flashlight is pretty handy too.
Now for the negative bit: The sound quality is terrible. I just used it to phone somebody and it was pretty embarrassing as I had to keep saying asking them to repeat themselves. It's not actually the quality of sound that is the issue as such; it's just very, very quiet. I was in a quiet room making a call and I couldn't hear the person on the other end. If you were trying to make a call in a busy, crowded area you'd have no hope. I can't seem to find any option to turn up the volume in the menu either (though feel free to correct me if anyone else has found out how to do it). Also note - I'm a 20 year old with decent hearing so this SHOULDN'T be an issue, but it is.
Also, I know this phone is very basic, so the music player was a bit of a bonus that I didn't really need. However, the fact that it has a standard 3.5mm jack and can handle a 16gb micro SD card is a pretty good selling point for someone like me who loves music, so I was kinda hoping the music player would be good. It isn't. It really, really isn't. I've never seen such a bad music menu on anything in my life. I put in my 16gb card with over 2000 songs on it, and there is no option to search for a track. You just have to scroll through every single song until you find the one you want to listen to. This takes a while.
Overall though, a decent emergency phone with good battery life; but I definitely wouldn't recommend it as a main phone, and certainly not to an old person or anyone who is hard of hearing (I know these type of phones are often bought for older people who don't want lots of gadgets).