I'm with Festus. Things you have to worry about with the cheaper red dots are:
1. Will it hold a zero?
2. Is it bright enough not to get washed out in the bright Florida sun
3. How much Parallax it has. Ones like Aimpoint and EOTech have little to none were the cheaper one have more.
But KimberRB has, I think, a BSA on his AR and has not had a problem with it yet.
Luke I have an almost new BSA red dot that I had on my Walther P22. If you would like to borrow it and see how you like it you're welcome to try it. Send me a PM.