I was a member for two years. I liked the thread samples they sent, but as for the site, it didn't live up to the built up expectations based on the promos for it. I ended up not using it like I thought. My JoAnn's always hassled me everytime I used the discount card. Got fed up. I don't miss not being a member and in the future would rather use the money for fabric anyway.
However, I had the money at the time and tried it. It wasn't for me, but you may fall in love with it. If you're interested, have the money, and like to site surf, it may well be worth it to you.