Review (5/5): Wide range of uses, very nice addition to almost any household
I got these to help apply body oil, but ended up using them for that and more.
They are great for cleaning if you like to use your own homemade products or just like to buy refill for products without wrestling with those chintzy plastic bottles.
I particularly like that glass is pretty much chemically neutral, so you don't have worry about these breaking down or interacting with what you put in them.
Of course because they are glass, they can break, but the fact that they are glass is more of a positive for me than a negative.