I was looking through the site and saw they had refurbuished system bundles for sale. I was wondering if had one had any experiences purchasing used systems from the ebgames site and if they a worth buying.

Keep the 90 warranty in mind when a console is bought new. In my opinion it's worth paying a little extra for this. EB does test out all the used consoles they sell, but I don't think there is a warranty.
I think calling these consoles refurbished is stretching things a bit. Most likely these are traded-ins that have had no work done to them, but probably run fine.

I think EB offers a 6 month warranty on used systems. This may be in store only though.

Gamestop.com would be the best way to go I think. Last time I check, they had refurbished systems for $180 I believe, which carry the same warranty that a new xbox does, and used systems for $150.