Oh yes, I swear by mine! I had never experienced one until pretty recently...a tangent here but when BF and I went to Portland OR to meet my new nephew over memorial day weekend we stayed in a wonderful hotel where featherbeds were standard. Right away I knew I needed to get one of these for home!
I found an upper midgrade one at Macy's and the SA gave me some good tips: first, put your mattress pad over it but just tuck it over the pad only rather than over the full depth of the mattress as well (prevents excess flattening). Then, put your regular fitted sheet over it and tuck it all the way under your regular mattress. Most fitted sheets are deep enough now to accomodate this. She also suggested vacuuming the featherbed itself with a regular vacuum cleaner to keep the feather escape in check. Honestly, I don't see it a huge problem b/c I use the mattress pad cover.
I rotate the featherbed (flip over and header to footer) each time I change my sheets.
Love it to death - enjoy!!