Refilling ink cartridges

I just had a couple of my cartridges (black $10, color $15) refilled at Walgreens and would like to hear from anybody who has had this done. How long can I expect the ink in these cartridges to last? I've heard a lot about buying your own 'kit' and filling the cartridges myself, but I don't know how complicated it could be.

Did I get a decent deal on my refills? Is there anyplace that does them cheaper? I'd like to hear about your experiences, good or bad with refills. I am sick and tired of paying full price for brand new cartridges at places like Office Depot. Just can't afford it.

Chime in people.