I have hosted 4 swaps, and one was almost a complete disaster because of several who signed up did not even let me know they were dropping out! Thankfully, those others involved DID do more blocks, so it was okay. Swaps are very time consuming for the host, but I love doing them! I am a meanie when it comes to the guide lines though, and for the last two, it has worked out very well. I was able to get all of the blocks swapped and mailed within 7 days.