My friend uses the Dell Vistro 1500 since 1 years, and his experience is very good for the office work.Its not going to hand on long and hard processes but some times it started hanging problems.
My friend increase the ram 2 gb more. Then its work better now wecam paly hard gaming like grand theft auto san andres without getting hang.
The audio quality is so poor.we can not hear the voice of the songs in the next room.The processor is good in this model.there are no heating problem even playing games more then 3-4 hours.