i have been using one of the first aerial brushes that weight about 310g, but this new one is roughly 250g which is noticeably lighter, its a shame the weight wasnt reduced to nearer 200g, because that would be an excellent weight yet maintaing good cleaning power.
i not too sure on the temperature, but on my old aerial brush it started to go out of shape over 30deg but that was not a hybrid, so i dont know how the boars hair reacts to hot water.