I would just like to add that it wasnt all of the first batch that had board/poppet problems. A lot of the guns worked fine.the main problems with the very first mini's was caused by the board, by now these should have all been changed, everyone who had a mini should have had it upgraded and any made or were still in the warehouse when the fault was detected were changed.
I love my mini, someone said the trigger was a bitch to set up but I managed to do mine really easily and have it set up so it rips really easy, it takes no effort it just wants to kill people.
as everyone has said, really easy to maintain, lightweight, rips, has the modes you'll need.
I can safely say that any mini ordered new, will be a modern, fixed one.
And if by chance you do have any issues, and want some impartial advice, you can contact any of the MK Storm guys no problems. Likely it will be a user error, and easy to fix.