A couple issues I've noticed. Sorry if they have been mentioned as I don't have time to search and read much.
1.. When using a dimension command and after I have picked the two points, the dimension number and arrows are black. Then the final click to place the number, it turns the number and arrows to the layer color. So I use a black background and this "invisible" dimension number is very annoying.
2.. In V5, if we had a dimensions selected we could goto the properties and quickly cycle through the styles with the up/down arrow keys. In V6 we have lost this ability. Same for text, I can't cycle through fronts.