The 600m I purchased for $1200.00 in june 93. I had purchased a full warranty for only one year, which I used twice (loose higes on display and keyboard breaking). The wireless connection was never good (tried updating drivers)..but the other 5 computers on the network had no problems. The mouse always had problems, freezing up on boot up about 1 in 10 times. Last month, the system fan began running at full speed all the time. Also, when any pressure was put on the bottom of the system, the whole thing would power off!
The system now runs, intermittently, very slow. To the best of my knowledge, I have a bad motherboard, which I've read is common with 600m's from 2003. Cost to fix... approximately $400-$600. Moral, spend the extra $$$ on an extended, long-term warranty when buying a Dell.