Review (5/5): The bottom comes off relatively easy, if you try
This airless bottle works as advertised. The bottom comes off relatively easy, if you try, and that can make loading up more product easier. However, you could also just use a regular lotion pump to go in through the top.
I wish it was more than 0.5 oz, if only because the contents of the bottle can occupy only around half the total size of the whole product. It's only about 1 inch shorter than some of the 1 oz airless bottles out there, which of course whole twice as much lotion or whatnot.
However, if that extra inch makes all the difference for you, then this option may be the better one. I already have plenty of the 1 oz bottles Amazon has for sale, but I still end up using this one for moisturizer (which I don't need as much of in my purse as lotion, which I put in the 1 oz bottle).