I just upgraded my 10/22 to a Nikon ProStaff because the Simmons 3-9 I had on it wouldn't reliably return back.
I was shooting silhouettes, had it zeroed at fifty. Dialed it up for 75, hit them, (well, most of them), dialed up for 100, hit most of them. Dialed down for 25, (which is same as 50), and missed the first shot because it was high. Compensated for it, but missed a couple of the fifty yard shots and saw I was shooting high. Zeroed it again, and saw same problem.
Talked to a friend of mine I was shooting against, he recommended the pro-staff, I looked through it and it was just as clear as the simmons. I bought one, took it to the range, zeroed at fifty, then ran it up and down without issues. Only funny thing about it is that it's set 1/4 moa at 50, whereas the other was 1/4 moa at 100. So, for my 9" drop at 100, it was previously 36 clicks, now it's 18. It's got spring-loaded re-set to zero turrets, and parallex adjustment on the model I bought.
I'm pleased with it.