Most touch free presoaks have sodium or potassium hydroxide in them, or a combination of the two. Used carefully, they are very effective and so far has been my most accurate predictor of a presoak's performance. I'm always interested in a product that will clean with less alkalinity, but I'll be delaying my order of a 55 until I try it.
The $100 sealant (if that refers to strictly cost of the product)is a gimmick, normally used by car dealers on their dealer invoice. A good sealant can withstand a dozen or more touch free washes, even washes with high alkalinity like mine and doesn't cost an arm and a leg. For those of you interested, try jescar powelock or collinite 845, (which bead's water like a ducks back)