Pros : It always burns off in the kiln....I made the mistake of buying cheaper glue that claimed it burned off, and ended up with pieces that had blue haze all over them, it was VERY disappointing, so I learned my lesson fast!! I will NEVER stray from using this, since I work too hard on a glass piece to have it end up looking like complete junk when it's done! If left to totally dry (which you SHOULD!!), it actually has a reasonable amount of adhesive strength...personally, I don't like to touch my pieces much after they are finished and dry (other than to transfer them to sometimes needing to move them to a kiln shelf!), so I have never seen a true problem with the amount of adhesive strength it offers when dry!
Cons : Yes, it is runny, but the other kind I have tried was too! So, is it really a con, or is it just what one should expect when using a glass fusing glue?!?!
Other Thoughts : Basically, it's the only glue that I truly trust to burn off every time!! Yes, it's runny, but others I have tried are as well....this is really one area where you simply can't cut corners and go with a cheaper option=YOU GET WHAT YOU PAY FOR!!!