Ever since I tried almond milk, I've never gone back. I was never a big fan of dairy milk in the first place, but almond milk makes cereal and anything else milk-based so much more pleasant. it never has the tendency of tasting or smelling 'off' like cow milk, and many manufacturers add about 50% more calcium than a glass of regular milk. What's not to like?
as for the price markup, if it means that I'm not gonna have to buy almonds, grind them up and do all the filtering myself, then that's fine, I think it's worth it.