I have bought kits and they have worked out really well. I like to have a kit or two on hand in case I need to make a quilt in a hurry. Having all the fabrics plus the pattern together is a huge time saver for me. Last year I made a nice queen size quilt from a kit and gave it as a wedding gift. It came out very nice.
I have to admit, I really have more than just 2 unmade kits on hand. More like 10 - 15. But I have convinced myself I will get them all made eventually.