This set has helped me complete my makeup brush collection (for now, at least)! It includes four face brushes; a detailer/concealer, a buffer, a foundation and a contouring brush. They are all great quality - very soft on the skin but not too flimsy. The bristles are strong and dense, hold their shape well even after washing several times and haven't shed at all so far.
I've used the buffing brush with my sample of BareMinerals, and it works perfectly. The foundation brush has made a huge difference in my makeup application - it gives a lot more coverage and still looks natural. I've used the contouring one mainly for blush so far but it's awesome, and the detailer can be used for lots of things, like concealer or lip products.
The set comes with a travel case that fits all the brushes with room for more. It's sturdy and compact, and I use it to dry my brushes in upside down which is so much more convenient!
I read a ton of positive reviews about Real Techniques before buying these, and now I can see why so many people love them.