in sydney the type of glass probably wont make much difference at all. It is my belief that it all has to do with how the glass reacts to temperature and thye temps in sydney dont go low enough to worry bout it. If I am wrong I'll be corrected
andrews and bintel both sell the same scopes but labeled different. the scopes are both made in the same factory (guan sheng) and quallity is pretty good. they may have different deals tho so you might want to email them or call them
(eg andrews usually throw in a couple of extra EPs)