adjusting the diopter to your vision is key no matter what. ditto finding your eye dominance. I'm cross dominant, so don't be surprised if the eye that is most comfortable is the opposite of the hand you write with.

Funny thing about viewfinders. I bought the camera I currently use primarily because I wanted a better OVF to use with my manual, legacy lenses. But since I work so much with a tripod in a position lower than my head, I end up using Live View almost 100% of the time (that swivel/tilt screen is a lifesaver), thus bypassing the OVF. When I do use it though, the improvement over my old camera is marked, but it's nothing compared to my OM-1. : )