I adore these and am delighted to see them on Birchbox; I'd like to see them offer all of the available flavors here. I think they're fantastic - but they're not for everyone.
The first ingredient IS petroleum, which might turn some people off. This balm is kind of like a thicker Chapstick, with better, more grown-up flavors. But this means you only have to apply a little to get soft, moisturized lips. I slather it on at night and don't have to worry about waking up with chapped lips. These tins are large so even if you use it liberally, they'll last a long time.
In addition, the flavors/scents are fairly strong - especially La Vie En Rose. I love it, but if you're sensitive to strong smells, you probably want to buy something else.
If I had one complaint about the product, it's that the packaging is kind of hit or miss. One tin I own is a little difficult to open, and one was clearly botched during production and doesn't have a nice smooth edge on the top like it should. It's not common enough or annoying enough to make me stop ordering them, but it's something I hope they'll improve in the future.