Honestly, I hate it when sempais try to teach me while we are practicing. It kills the rythm and spoils my training. I have to admit however that on some occasions, the advice was very helpful to improve my Aikido and I still remember it untill now. Nevertheless, I still don't like it. I believe that each person should be allowed to find one's own way, unless they ask for help. Trial and error is the best teacher.
I admit that I surprise myself giving more advice to lower ranks than before. So I try to control myself, even though it is difficult :-) Well, this is Aikido...