I have subscribed to SEI's kit club since last summer. I like the quality of their paper, and the kits aren't monthly, they're bi-monthly which works better for me. Also, it's super-easy to skip if you don't like one. They send you reminders so you don't forget to check it out and skip it if you don't want it.
That's the only one I have experience with but I would give them a very high rating based on my experience to date. www.clubsei.com
I do studio calico. I have enjoyed the kits each month. They are very popular, so are therefore given some bad feedback( you get that with the huge volume of numbers, and I am afraid the squeaky wheel is always heard!!!) ....I have had no issues with them at all. In fact I would say they are over the top in their customer service!
I guess when they have such a huge customer base that speaks for itself.
A friend does cocoa daisy and loves that....but the shipping is too much for me being an international