For me the Sheer Mystery Powder has recently become much more valuable!
The compact from last year's collection is special to me, so I carry it around in my purse at all times. I use it mid-day or whenever I need a little touch-up as an all over powder. It's very light and doesn't add a thick cakey layer of powder to my already done up face. The best surprising result for me is under my eyes...it doesn't settle in the tiny little fine lines just starting to form under my eyes, and it makes them look better. I have no idea if this will be the same for anyone else, but I'm in love with it for that reason alone.
Is it worth the heavy price tag? Probably not. For me though, it's worth the splurge...I really love it!