I bought 2 core collections as I love the buffing brush so much! It works with every foundation I use from full coverage like Estee lauder DW and the lighter end of the spectrum like MUFE face and body. I use the detailer brush as either a lip brush and the contour brush either for contour or buffing in undereye concealer.
Well worth the money, they wash really well and keep there shape too.
I bought my bits today in Mac fromt he face and body collection, I picked up both brushes, (I think the 215 will be well loved!), 2 pro sculpting creams in accentuate and pure sculpture and a Face & body foundation to replace my MUFE one which is on its last little bit. Will be interested to see if it lasts as well as the MUFE one, feel much happier trying a smaller bottle! I think this might have been my biggest mac haul for a long time, the last bits I bought were from the brush collection.
I nearly snuck in a mattene and blush from styleseeker, but told myself I just didn't need them!
I recently started work at a new job in the next town, the mac counter is a 10 minute walk from my office, dangerous, I also discovered that the Debenhams here has been refitted in the beauty department and it has a urban decay counter and an origins counter, things I had to go to London for previously! Must limit the number of days a month when I go out for lunch otherwise I will be in big trouble!