Pros, erm................ you can get it cheaply.
Cons, its not very good, it's probably the fastest drying sealant i've ever used. A few weeks after fitting, both tubes flatted, nothing came out of the hole, it'd completely dried out. That was 15 years ago, never used it since.
Try something that works instead, there are half a dozen other alternatives.
(And if you are running presta, get tubes with removeable valves and an applicator bottle. Just goes straight in. No fuss.)