Finally got around to trying out the Cleito RTA this morning. I was planning on putting my own build in it but just wanted to try it so I just used the clapton build that already came installed, just had to wick it.
I have only got 1 tank of juice through it so far but it has great taste and clouds. I would have to get a 2nd Cleito to be able to compare the RTA to the prebuilt coils, I think it is that close. The prebuilt is probably more airy, just figuring that because of the horizontal coil on the RTA vs the prebuilts vertical build. It is still very airy though, I don't think anyone would complain about that.
I haven't got any dry hits with the prebuilt 0.42 ohms dual clapton at 45 watts and no leaking, this has a lot to do with how well you wick but it was easy.
If you love the Cleito with the prebuilt coils then I think you will love the RTA and it is a no brainer for the price. You definitely will want to get the 5ml Cleito glass replacement if you take the Cleito on the road with you, probably only holds 1.5 to 2ml of juice with the RTA installed.