Should you get one, after you install it you'll see how solidly in place it is.
I also didn't want to get my pistols milled. That's permanent and should you take the optic off, it's ugly.
Some will say, "You lose your iron sights!" That's correct, but only partially. You still have your front sight and with a little practice, you can gauge the front sight through the optic and be on target for self-defense purposes. For years people carried snub-nose revolvers with a minimum rear notch and shot people. There's a certain amount of 'fear' from some folks about losing your rear sight, but I think that's 98% marketing-induced fear.
Optics have greatly improved in construction in the last 5 years and are dependable, even in budget optics. Change the battery yearly (they're cheap) and don't worry about it.