Not great; thinking it is the build rather than the rta honestly. My guess the coil is too large to let the af wrap around all of the coil. When I'm not feeling so lazy I'm going to switch out the af insert for more air. Probably will be too much air but it's a lazy way to test my theory. Thinking a smaller coil will fix it like it fixed my beloved solos. The rta itself I like, very smooth af regardless of how open/restricted and so easy to build.