21 Super is OK. I tend to pass on the standard 21. 51 is superior to both.
In my experience pens that are jostled can end up with extra ink in the feed and act of but it rarely happens to me. What I normally have to contend with is changes in temperature where if it's cold outside during my commute and then going into a warm building might cause some burping issuesThe glued crack is still holding.
I took the pen to work in my computer bag, and that did lead to some blots. I have no blots at the house.
Is it normal for jostled pens to act up?
This. There are so many 51's out there, I've never felt the need to get more than one 21, just to try. Sure, a 51 costs more, but they last forever.21 Super is OK. I tend to pass on the standard 21. 51 is superior to both.