I have the Sigelei version called the puritank and its my all day atty, holds 4 mil, takes protank heads, nice thick glass. I also have the protanks so its mighty convient having all the same heads. I dropped my puritank onto the kitchen floor and snaped the threads...but again so convient is that a protank base screws on(its a bit smaller but it works) and back in buisness again. I'm just assuming the davide is the same way or is even glass but I don't know cause when my puritank bites the dust would prolly get a Davide in replacement. I like the 4 mil capacity rather than just the 2.4 of the protanks and its only bout 3/8 inch longer but a bit fatter.