Initially when training on a glass cockpit (referring to a G1000) I found there was a tendency to read the altitude or speed exactly as it was, and an attempt to correct it.
For elaboration; on steam gauges 'keeping the needle at the top' or wherever it needed to be and holding it there meant you were maintaining altitude. I found when using the G1000 that reading altitude as '1980' when I was trying to maintain 2000 made me have a tendency to correct it, even though 20 feet really isn't that much difference.
Now with quite a few hours using them it's become natural to understand what to feel...but for new students who are learning on the G1000, I personally find it's all an information overload for them at that stage in training.
Preference: steam for lighties.