I made one last summer and I really like it for those warm nights when my down is just too much. Also it's a great loaner for a newbie. I haven't got several down UQ rated for diff degrees yet and this was my best alternative.
As a matter of fact I'd been asking around about getting another one because I'm gonna need a lighter TQ for this summer. And just yesterday found out about a new surplus store at the flea mkt while I was there. I drove all the way to the other side of town to check it out and scored one for 15 bucks!