I've always been annoyed by how icky traditional sunscreen makes me feel, so I was happy to find out that there's a roll-on sunscreen that works reasonably well. I've used it a couple of times now, and while I wasn't outside for long enough that I would have burned when I used it in either case-- and therefore can't comment on the effectiveness of a single layer of the stuff-- I would say that applying it was much quicker and easier than applying traditional sunscreen. While applying sunscreen isn't the lowest hanging fruit in health interventions out there, it's still useful for reducing one's risk of death from melanoma (yay for living longer!).