When 2 panels of the same type are made, one is either placed slightly above the other or can't be adjusted to the same height. Same for the resulting distances between them.
Might be a nitpick, but it kinda triggers me a lot to look at this (-_-).
Strangely enough, the width doesn't have this problem.
Also, would be nice to be able to set a certain distance as default.
I have this problem with height, width and snapping to grid as well. Very annoying. Sometimes I manage to get all the panels at the right size except one and it makes positions and/or sizes inconsistent.
Snapping to grid should be a lot more reliable.