Is it worth buying a used 2011 or 2010 Macbook Pro

I'm looking for a new computer and have been interested in the Macbook Pro for a while. The problem is, the new ones (even the 2012s and newer) are way out of my price range. On eBay, there are several people and high rated sellers who are selling 2010 and 2011 versions of the Mac Pro. These are in my price range but I'm concerned that they're too old.

I plan on doing video editing and writing. I also want to be able to bring it to college with me in a year. My other option is to buy another Windows PC but I really would like to upgrade to a Mac.

I know Macs have a reputation of lasting a long time if cared for properly but I need suggestions. Also, would a Macbook Pro at that age even work okay with Yosemite?