So I see that a lot of people love the protank. Is it something like the vivi nova? It seems that it looks the same. What is the difference? I am thinking about getting one because of all the great reviews but I am afraid of breaking it since it is made of glass. Is that a problem? Right now I am using the T3. I like the bottom feed because it is easy... but its cold air and gets a little annoying. Someone point me in the right direction. Thanks. 
