This may also vary by University and professor

Probably. There have been a couple of courses where I'd probably done better on tests if I'd attended the lectures, but these have been rare exceptions. For the most part, skipping the lectures has only been beneficial, and I'm far from the only student who has found this to be the case.

I also never got the impression that most professors particularly cared about lecture attendance, if they were pure lectures. Classes that involved actual discussion are different, of course. (There's probably a correlation with the fact that in order to have useful discussion in a class, the class size can't be too large, so pure lectures tended to be mass lectures where the professors were unlikely to notice your presence or absence anyway.)