Stone chips repair

Has anybody experience with this product, or similar one? It looks very simple and effective:
chipex.co.uk
or video:


Want to buy one and I am curious if it really works so easy.

Purchased that kit for my Orkney Grey Evoque. Easy to use, but the colour didn't match that well. Maybe fine for black or white.

I have barolo black, so must be better then white chips
I will give the feedback after doing the repair.