I like almond milk. I'm not completely religious about it, I still consume small amounts of cow's milk in things like waffles that we are making for the whole family every once in a while (like once a month), but routine or large amounts give me an upset stomach.
I prefer almond milk over soy, the latter is too sweet for me. The hardest part is giving up all the yummy cheeses - I find that harder than ice cream! And not as many substitutes available, soy cheese just isn't the same. Other than that, I haven't found it very hard at all.