Thought I would give an update on my thoughts:
The pico has been really easy to get on with, and in next to no time I had the hang of squeezing and firing at the same time, with just the occasional weeping from the air holes.
Battery life is better than expected running on a vtc5a.
The hadaly was fitted with some flat ni80 @.57ohms and performs superbly.
Might drop a wrap when I need to recoil and bring the ohms nearer to .5 to see if there is any noticeable flavour difference.
I am amazed just how much flavour I can get from this setup, and can't believe I've been missing out on this. Probably could have saved myself a few quid on tanks I don't need.
I did try the hadaly in a different mod with a lower build and higher watts while waiting for the flat wire to arrive, nearly melted my lips to the cap.