Super happy with my purchase, I had some trouble early on trying to figure out the right coils to use, because the resistance is so low with three coils, I settled on a 26 gauge 5 wrap macro coil, easy to build and it works great it this rda (resistance works out to be around .125 ohms). The airflow adjusts the same on each side and I usually leave two holes open all around. Build quality o rings and grub screws all have held up now for a month+ of all day use. I would buy it again.