I have not personally used it in a summer quilt but it was quite a discussion on just that at our last guild meeting. A number of members had did it and were happy with the result. In Minnesota it seems we only use a summer quilt for about 4-5 month anyway so the quilted looked isn't a big thing to me. Keep in mind though, the flannel will shrink quite a bit so you may want to pre-wash and dry several times before putting it in the quilt. The quilting aspect was not discussed though. I use it a lot with table toppers/runners. I like them to be a little flatter so things set on them are not as "tippy".