I've made a kit from Connecting Threads that I was more than happy with. Great fabric, and lots of it.
I've done one of the BOMs from Joanns (an old one where I picked up the months on Clearance from various stores and on-line - couldn't pay current prices!). I'd been warned that sometimes they short you on pieces, so I bought two extra "setting" kits (at $1 each). Sure enough, I was missing two pieces and one piece had a "run" in the fabric. I was able to substitute from the setting kit and loved the finished project, but would have been extremely upset if I didn't have the extra fabrics to use. I don't really trust the Joanns ones and haven't tried any others from them.