unfortunately the quality control can be shite, and the NIB pin can very well have issues straight off the box. Recent releases have provided a ton of issues for new buyers.

I have had no issues with mine, very happy with my nib experiences and will do it again for sure.
I have had lots more problems with older 2nd hand games that need everything from board work to new ramps and switches...etc etc.
Some dealers sell absolute shite 2nd hand pins that need plenty of work, there are two 2nd hand pin dealers here in Brisbane that come to mind instantly.