I have the Skyhook and ijoy limited classic. I still want the rdta5. It's a much nicer looking rdta to either of the other two, but I got the classic because it's orange. I think they all perform very similarly
The skyhook is very well built but the refill hole is share by the wick. The cotton can prevent filling if it blocks too much of the hole. I have gotten pissed a few times when that happens. Otherwise I love the Skyhook.
The classic has the IMC deck system. This is the same interchangeable system as the ijoy combo and rdta box. I am still trying to get the best build on this. The design and quality are top notch and the fill hole is separated from the wicking. The classic and skyhook are like cousins because of their similarities.
But, I think the rdta 5 is a beautiful rdta and it has an interchangeable deck system as well. I am not sure what decks it uses. You also have to remove a screw to get to the build deck every time you rebuild. Not a deal breaker for me, but thought I would mention it. I will definitely be buying one of these.