Just remember to close it before try to light it again
(guess how I know... )
You realise after a few pumps anyway if you do forget, and that is your priming fuel already sorted! I think it's a great bit of kit, and the fact that you just turn the fuel line to change the burn and don't need to go near the hot end is a bonus for me. It's well worth shelling out for the Nova+. I had a mate who had the Whisperlite who couldn't believe how small the Nova+ packed down and how controllable it was.