Just try it already.
First let me say,  this is an AWESOME tool! I've been using this about a month.  I use way way less product. Prodict glides on effortlessly and more uniform. I can actually build coverage. Brushes and blenders seem to be splotchy when trying to build coverage, this doesn't do that.  It does take some getting used to because it is so different from brushes or sponges or blenders in a better way.  You'll ditch those, quickly.  The only reason I didn't got it 5 stars is because there's a coating (I guess) on the sponge that separated and tore off.  I'm not sure how this will effect long term use.. so far, no problems & nothing else has further separated. You can see the separation in the last photo.  So far, minor but spreading.
Rating: 4 stars