There's nothing fundamentally wrong with an rta, but there are slight issues (more or less slight depending on preference). It's difficult to make a squonkable rta. Unless your wicking is spot on, opening a top fill rta when it's half full (to top it up before you go out, say) runs a higher risk of flooding it. There's that flavour thing - I always found a dripper to have more flavour than a tank, people say it's because the vapour tract is shorter. RDTA has this short tract. If this was just another rta I'd be unlikely to give it a second glance, but because it's just another rdta I'm pretty interested. Being able to switch the airflow right under the coil looks good.