I have a primary arms, and the first one they sent me would not zero at all. I emailed PA, had a response in less than half an hour, and they sent me a replacement that day, with return postage for the bad one. While I still tend to prefer my irons, the PA is a reliable sight, and the customer service was phenomenal. The new one holds zero very well.
Being old school, I tend to like the irons, but I will admit that you get on target a lot faster with the RDS, and it is just as accurate as one would expect. I wouldn't put it through a ton of abuse, but that's just me. I would think they'd take a decent amount, and mine does get banged around a bit when I have it out.
If you want a solid RDS? I'd save your money up and ante up for a better sight down the road.
What part of 'shall not be infringed' confuses people?