I have been a long time fan of beauty blenders, but I can't justify buying an original one, as they don't really last that long, compared to a brush... However, I am a huge fan of the Real Techniques sponges, as I think their shape is spot on - with a delicate point at one end, so you can really work into the inner corners of your eyes and around your nose, and a flat edge at the other to blend foundation across your cheeks.
I think the finish I get from this blender is great, and I feel I use less product when I use a blender than I do when I use my regular brush. The only thing I don't like is cleaning them. If anyone knows a miracle product that can save me a lot of time I would love to know, because I can never get them perfect again!