I had purchased nokia 6300-silver color two years back.firstly the pros are that the design features are very good. It is sleek and sophisticated so gives you a very classy look. Its sound quality is normal. It is available in 4 colors. Its keypad is very user friendly. Its camera is 2 megapixel and the picture quality is very good. Now the negatives are that its battery life is VERY VERY VERY POOR.even if you recharge it in the morning you have to recharge it in the night time.
Even if you have not heard any music then also the battery goes down so that is really irritating because you have to recharge your cell everyday single day and this problem is being faced by all my friends who are having this phone. So I would seriously not recommend this phone because of the battery life problem.
The next problem is that if you have kept lot of data in your phone then your cell can hang or become slow. Recently while using the camera it was continuously going on the stand by mode. The headset also is not good.so overall I would say that "HIGH ON DESIGN, VERY LOW ON BATTERY".