I use the fugi kits, one called fugen boy that I got of a plumbing and bathroom supplies website, and one set from lidl by elk. They are both good but I still find it tricky to get the level of finish I want. Also I find I have excessive wastage when using the fugen kits as they seem to work best when moving a good dollop of sealant ahead of the angled profile which then inevitably is cleaned off and wasted. I have always wanted to try the corner tape system but could never bring myself to spend the money on it.