I use a toptank mini on a pico as my everyday vape and I'm very happy with the set-up. I use both pre-made stock coils and the rba and it's not hard to build on once you practice a little. One thing though is sometimes you'll get a bad coil and that's a pain. I found that after trying a lot of different tanks and rba's the toptank and an avocado are my go to's and they're reliable work horses.