I was a member of JustFab for about seven months. I only placed two orders, and skipped the rest of the months. The shoes are made with subpar quality. I'd compare the quality to shoes you would find at Forever 21.
Cancelling your membership is a nightmare. Brace yourself for having one of their "fashion consultants" try to convince you to stay. Overall, I would not shop using this site again. Not worth the money.