I have been seriously (!) semi-trying to hunt this down for years. The reason why I said "semi" is because every time I checked the ebay price ever since it's first launched in 2010 (ish?) I was like Who am I kidding? Nah, I don't need it for $50! I wanted it but have given up. So happy to see that M.A.C FINALLY brought it back in one of the latest collections. Me being me, cannot resist anymore after all these years of waiting despite the heftier price tag in Hong Kong (US$35).
"A luxurious velvet-soft powder with high-frost metallic finish. Smoothes on: adds buffed-up highlights to cheeks, or an overall ultra-deluxe polish to the face."