In the last several years I've tried many of them just to see what they were like. The only ones I've renewed are Quiltmaker, McCall's Quilting and The Quilter Magazine. I haven't seen anyone mention that last one yet.
Sadly, I haven't made too many quilts or projects yet from most of them. I keep finding other designer's patterns I love more, like Pam Buda's of Heartspun Quilts, her Prairie Women's Sewing Circle Club or her BOM's through The Fat Quarter Shop and I've designed several of my own, too.
I've printed off more freebie patterns found on the net and tutorials found right here than kept any from these magazines.
Often times, several of the patterns in these and other magazines end up on their respective websites for free, either for the current issue I saw them in and/or called by a different pattern name using other fabric months or years before. I'm starting to think that this is not the best use of my precious little funds. :(