I personally have not tried the cheaper sights but 2 years ago I did a lot of research on this same topic. What I figured out pretty quick was the majority of the cheaper sights would move on recoil and not hold zero. Now there were a few who had no issues with the cheaper sights but I didn't want to be the majority if I missed a nice bird and needed a follow-up shot, only to miss the second shot cause the sight didn't hold zero. Most will recommend the vortex venom, the Burris fastfire, and a few will recommend the Mueller quickshot which is roughly half the price of the other two. I ended up with a Burris fastfire and couldn't be happier. I hope this helps.
Chuck