I always pick my own fabrics and pattern. But, once in a while I run across one that flips my skirt and I have to buy it.
There is only one store that I really love to buy the kits from. Windy moon quilts. The person who makes the fabric choices for thier kits is exceptionally talented and different than I would even think to choose. There is always more than enough to make it. Most kits ask you to buy your own fabric backing, which I buy before leaving the store.
I am thinking of trying a connecting threads kit one of these days though. It seems like I have only heard good things about thiers. And they have very nice color sense. The prices seem very reasonable too.
But, I have material stacks that I have chosen for quilts waiting on me to make them I like too.
So, I see no harm in it. I like them.