I have the Fogger V2 and V3 ... I don't have the newest Fogger V4, but based on the various feedback I have read over in the RBA section, like the previous versions the Foggers are only as good as Yiloong's ability to produce consistent batches without error. When the Fogger is properly machined piece for piece, its a very good RBA however, Yiloong is notorious for inconsistent build quality amongst their devices, one of the reasons that I am not a fan of Yiloong.
Air flow channels that are not fully machined, poor threading on the chimney, crooked top caps, glass tanks that do not stay in place unless they are taped down, and the list of manufacturing flaws goes on.
In addition to that, I don't care for their business practices, specifically mandating retails cost as a condition of supply to vendors. They are no where near the manufacturing quality leagues of Hcigar, Infinite, and EHpro, none of whom demand that their products be sold at a set price point as a condition of supply.
My Fogger V3 is good, in spite of a crooked fitting top cap, while my Fogger V2 is very disappointing because the air flow is blocked, and the stainless steel tank fits with the top cap like a pregnant women's belly due to poor machining. The Fogger V4's seem to have the same inconsistent build qualities .. some are machined perfectly, while some are not. So, Yiloong can't have my money until their manufacturing quality meets up with their Ego driven price demands.
But I do hope that you get a good one Skorpeyon.