I have a mac counter a 10 minute drive away. Yes, they are best I've ever used.
Bloody susylvester (Yes, I know who you are) recommended the slate one the other day to go with graphite pencil. Offs I goes and buys the pencil and ask for the "slate" shade at the mac counter only to find it doesnt exist. Had to choose a shimmery grey one (very nice) with no preplanning.
I can feel another buy coming up though.