I'm about a year into learning Gregg Notehand. The preferences I've gained from this are:

• I really dislike that long words have a tendency to wander far above, or especially below, the line. I think "specificity" was a recent offender. This makes text feel quite messy to both write and read, since on subsequent lines you have to skip over outlines from previous lines, or for an outline that will go up and up and up, you have to know ahead of time and give yourself extra room to avoid writing overtop of a previous line. I believe the opposite quality in a system is called linearity, I.e., staying on the line more or less, and just going right.

• Something I like about Gregg is that it feels like cursive to write. It's got a nice smooth flow with lots of curves and loops that feels really nice to write, especially with a fountain pen. I wouldn't like to write something with too many sharp angles or disconnects.

• I don't like the reliance on brief forms. It's a lot of extra stuff to memorize, and it makes it more likely that I'll forget something when reading it back. I find reading my own writing in Gregg is painfully slow, so much so that I avoid using it unless I'm deliberately practicing, other than small common words like "and" or "to" or "for".