Glass bottles

Brianna • I've been with my husband for over 7 yrs, married 1.5yrs. After 6mo TTC we got the best Xmas gift! EDD 8.24.16
Has anyone here used them? If so did you like them?  I love the idea for sanitary reasons, but the main concern I have is are they heavy? Not just for us to feed the babe, but when they get to the point of handling the bottle themselves. No review I found mentioned weight and this. I hear they are pretty durable and don't break easily.