Nice! I’m after the 520 purely for the pnp adapter which they should have made as a separate purchase. That would have been clever!I use the Wotofo SMRT Coils and they never leak. They do leave a bit of condensation which I wipe off on about every third tank refill.
I like the pnp coils. They’re consistent flavour wise and don’t pop and spit and get all stupid.