The Core Collection

So I am quite aware that I am missing a brush from my image but it just wouldn't stay still. I have been eying up the real techniques core collection ever since I picked up the stippling brush. Going to be honest I mainly bought it for the buffing brush which has been the prize in this collection. I absolutely love that these brushes are synthetic hair as they are much easier to clean and are obviously cruelty free.
I use the buffing brush for my foundation and it makes it so quick and easy to create a flawless face. My foundation of choice at the moment is Mac studio sculpt and I find that is works wonderfully with that.
Recently I have been trying my best to learn how to contour and I think that the contour brush is really lovely for that. I use Benefit Hoola bronzer as it came in a little set and I find it gives slight definition to my overall pudgy face.
Finally is the flat angled foundation brush I just use this to work the concealer into my skin and its just a small little brush so I really get into my skin.
Do you have any RT brushes? If so what's your favourite?