I bought this RDA because I wanted something like the tsunami, but I wasn't sold on that with the complaints about the lack of room for cotton. I find the amount of room I have to tuck my cotton in here to be more than acceptable. despite the bottom airflow, I don't think this is an amazing flavor RDA, but it strikes a nice balance between flavor and cloud production.
The top cap comes off with almost no effort, maybe a thicker O ring would fix that. I've experienced no leaking that I couldn't attribute from my over dripping. The spitback guard is a really nice feature. It's neither the easiest nor hardest deck to build on, and the balance between flavor and vapor production is pretty pleasant. I wish the 510 was a little bit shorter, but with a spacer it sits securely on the cuboid/RX200/iStick TC 100w.
This is solid overall, I'm happy I purchased it, but by no means is it without its flaws.