I will confess, early in my sponge journey I didn't realise they were meant to be moist and expand so foundation application was weird for a short time. But when I did work it out, my foundation application stepped into the natural, less caked world and felt better using the sponge on my skin.
I bought this sponge after a fail with a cheap version that had tears in it after a few uses and missing the 'how to use' lesson re. soaking the sponge.
I love how this sponge applies my foundation without it looking 'applied'. I'm not a sponge scientist so can't comment like others on it's construction etc. but I love it it because it delivers the makeup application results I'm after. I love that it can apply and blend foundation/concealer with ease even for a less than artistic makeup person like me.
As much as I love the Beauty Blender reviews I don't know if I'd ever have the appreciation of a 'sponge' to willingly spend that kind of money - so I love that Real Techniques have products that don't break the bank but do a great job too.