boots are unviable, go with merc treads or lucidity. your R is a cleanse, so its un needed, flash is a good choice tho. your seals are completely off, how will 20 hp matter at lvl 18? i grab resiliance for early game defense and slight mid game defense.

i have some issues with the guide, but i also love it. not gonna vote

I put Mobilityboots for fast ganks. In my opinion its really required to be fast as a tank. It'a just a guideline to play for. I always play like this built and made my experiense. Often i take Teleport with Alistar or Fortify. And yes Boots of Swiftness could be a better choise in some situation.

Good build for a tank, but I would reccomend putting CV as a viable choice on alistar. I don't really think its necessary to have 2 cleanses. You shouldn't be running away if your a tank. (unless you're getting ganked or run into a 1v5 or something which you shouldn't because you can avoid face checking with CV). Are the ms quints really necessary though? I imagine they would be if you get a tank shoe (merc treads/ninja tabi) but you already have mobility shoes. If you want speed during a teamfight, might as well get boots of swiftness then for fast overall moving. Good build overall. +1