When i ordered my h-priv i thought its small and pretty, was abit disappointed when got it , its thinner than RX200 but its bigger overall, and its heavy , i almost dont see any difference in weight between h-priv to RX200 .Yeah, if clouds are a priority, 40 is not great. However, if I rock my Gemini on top of a 40 it is pretty good. I don't stress my mods & batts so much though so I would also recommend at the least maybe an ipv d3. And I would use my drippers at around 55/60. Really though, I would get a dual mod, I heard the sigelei 213 is quite small.
But , yeah but its very cool looking device.
I learn my lesson, always check description sizes and weight