I've owned several budget red dot sights, ATN, TruGlo, NC Star, etc. They all work.... for a while. The only one that I can say was worth every penny paid is my C-MORE ATAC. It's about seven years old and still works great. My habits are what they are. I don't think I am hard on gear, but none of the budget sights has ever lasted more than one or two years.
You can get lower line C-MORE sights at about $200, ranging up to the ATAC which lists for $444, but is probably easy enough to find for about $379. The CTAC is the same sight wiith polymer construction instead of aluminum. Watch out for airsoft clones. They are really accurate reproductions when it comes to appearance.
Here's mine with the MBUS front sight I use....
