there is a smaller bore tip going on sale tomorrow, airflow basically means a bigger more expensive device like the VIM, you've got to remember it's a £12.99 device, basically designed to be a 900mah podmod, if you look at the aspire sprite (device on the left) that's a 650 mah battery, no airflow and it's £30 I think, add all that to the fact you can't even put a stock tank in the sprite. I think the feature set is right for the price point, in fact compare to competition it's quite a bit ahead, and I don't think it's any bigger bulk wise.