I agree (even though I haven't tried them, been looking around and decided to try one soon... but first I need a RTA cause all I have is drop-in coil tanks)
On a sidenote: have you ever heard of the Aspire Quad Flex survival kit? Fun to experiment with and really cheap now (search with Vapecrawler) It can make a RDA, RDTA, Nautilus X tank and even Squonker.