Get the Sapor. For $29.99 authentic it's worth it. Post holes are huge, and in the 24 hours I've had it, I've noticed that you can literally fill it up with juice to where the cotton is over soaked and it won't leak. I got it just to see how top airflow is and I love it. I may buy an Aeolus v2, Pugio by Hyon USA, or a Kennedy 24mm (second two are bottom airflow) once it comes out. I consider it a stopgap in between trying to decide what my next atty is gonna be.
I've owned a few cloned atty's in my day, some of the "entry level" atty's like the doge, mutations, Sapor, and I have a few high end atty's, my derringer, Petri and Hobo v3.1.
If you're going to get a 2 post design check out the STRO mini (NOT the mini v2)..it's $29.99 & has the same deck as the velocity minus the notch. If you're willing to spend more money I'd say get the Petri v1.5, I love my Petri (I have the original) and in the 1.5 they made structural changes to the deck and center pin that make it more sturdy. Also larger post holes and thumb screws on the posts. If Dotmod came out with a 24mm Petri tomorrow that spaced the posts a little wider and the post holes a little bigger, I'd buy it upon seeing it.