I prefer to apply this by dotting it onto my face and then pressing it into my skin with a damp Real Techniques Miracle Complexion Sponge. It applies very evenly and smoothly this way. Sometime's I'll even mix in a drop of BioOil into the foundation before applying to get a dewy glow!
I apply mine with the Real Techniques Expert Face brush and it applys the foundation pretty well but sometimes it looks a bit streaky and I have to in and fix it. I have not tried the beauty blender method as of yet.
I like to apply it with a flat foundation brush all over my face and then blend with the Beauty Blender. I find applying it with a normal bush or the BB by itself just gunks up the brush and makes the BB sticky since when it dries it's long wearing.