It could be worth though there is always some measure of risk purchasing refurbished electronics.
I purchased a refurbished 15.6" Dell Latitude 3540 with a Core i5-4200u, Radeon HD 8850m, and 1080p screen for less than $500 back in January 2014. I purchased it from an eBay seller with a rating of over 98% and I think had over 10,000 sales. It was advertised as have been refurbished by Dell with 10 months left on the warranty. I decided to take the risk since ebay does have a buyer protection plan. Looking at Dell's site a new Latitude 3540 with the same configuration was selling for around $850.
When the laptop arrived everything seemed to be in order. It came in an official Dell box with all the accessories and a statement from Dell...