It's amazing to see nebulae in another galaxy and so clear, and green!
Even the dark dust lanes and embedded clusters look so familiar, like our milkyway widefields. Makes you think how similar things stay even so far away.
One of the things I find very cool is that if you zoom in on any of the "black areas" away from M81 itself, and you'll almost certainly spot a few galaxies. (Unfortunately, you can't zoom in on each of them to the same degree!)
It seems that empty space ain't so empty after all!