Help wanted: Used Dell Laptop--- a good deal?

My school has used laptops for sale.
What do you think about it?
Thanks.

Dell Latitude D510, used laptop – student machines
1.6GHz processor
512MB memory (single stick)
40GB hard drive (5400RPM IDE)
14.1” LCD
CD-RW/DVD (CD burner, DVD player)
Wireless card installed
4 USB ports (USB2.0)
Manufacturer’s Warranty (Dell) until July 2008
Windows XP Professional operating system
AC adapter, support CDs included

$428