I've been using homemade quilts for years. I love the freedom. It all started for me as an easier way to hammock camp, but then carried over into 3 seasons of use. There are few downsides to quilts and many good reasons to use them.
I limit quilt use to temperatures above 30* mainly because I have a 20* Western M bag that I spent a huge amount on and because I like a solid safety margin. It all goes back to one night that the temperature fell 10* below predicted temps. It was 20* at 5 pm and fell to 10* in less than 4 hours. It stayed that way all night. I was nervous. It was hard to get to sleep, I lay there shivering and shaking, but finally got the bag temp to warm up enough that I fell asleep. I awoke several times during the night to adjust my bag and to eat some M&M's. Sealing the hood to retain warmth was critical.
Had I been caught in that weather with a quilt I am not sure that I would have been able to sleep at all. Its an individual decision, but I limit my quilt use to 30*.