I had a super-weird experience with this sunscreen. I was using Biore Watery Gel, which I liked, but heard the buzz that this was more moisturizing so I decided to try it out. It's a thin-consistency, white liquid, easy to apply and absorbs quickly. And yes - I felt it was more moisturizing than your typical Asian sunscreen. I thought I had found my new HG.
A bit later, I started experiencing some weird skin issues, most notably the fact that I developed red/yellow scaly patches under the nose pads on my glasses. They would flake, get red and sore, go away, and then immediately come back. Even the doc was puzzled. After a process of elimination (including meds, creams, steroids, etc.), I decided (after thinking back to when this started) to take this out of the routine and voila! A few weeks later they went away for good. Back to Biore I went (which is great!. I noticed around this time I also started to experience some very dramatic cystic breakouts on my chin. Those have also subsequently went away.
I don't have extremely reactive or sensitive skin, and most products don't break me out (except Philosophy Purity!). As always, YMMV. I wish it worked for me, because honestly I liked the finish, the moisturization, and how it wore really well under makeup (hence the 2 lippies). I have switched back to Biore but this time I'm using the Watery Essence, which I LOVE (new HG). For me, it's more moisturizing than the Gel, so I get what I wanted out of the Skin Aqua.