I had a classic 160gb iPod with a trashed battery. I found iPod doctor online and decided to try them. I chose the "relax" service and the container to ship my iPod arrived the next day. The iPod was posted to them on a Monday and i received it back cleaned and fitted with a new battery by 10am on Thursday.
At every stage i was kept up to date by email
I would not hesitate to use them again in the future.