When I got my MAP tank, it did leak a bit from the top when it was laying on it's side. What I did was put one of the smaller silicone rings from a standard clearomizer inside the top and no more leaking. It worked well for me 🙂
I just recently started getting into mods… I only have 2 right now. I have the Prodigy V2 and the Spade. I love my V2. It is quite awesome. I just recently got a low resistance atomizer and it works well on the Spade.