I have two and both have run perfectly. However, there are some cut corners on these rifles as the above chart clearly shows.
This does not mean that the rifle is junk or that it will ever fail or have a problem. A lot of the things "skipped" on these (and most commercial) AR's are essentially insurance to help reduce the chance of a future failure. Fortunately, most are easy to fix after the fact.
1) Stake the castle nut - costs nothing if you own a spring loaded punch
2) Properly stake the bolt carrier keys. RRA staking is a joke, like most other AR manufacturers. Also spend $4 and upgrade the extractor spring, insert, and add the O-Ring.
3) Get a Milspec receiver extension and ditch the commercial one. The threads are shallower on the commercial tubes, and although the metal is technically thicker they are weaker overall because of this.
4) Get a replacement BCG from a company like Bravo Company that has high quality bolts that are MP tested and properly staked. Use this BCG as the primary, and keep the RRA BCG as a backup. You should have a backup part anyway, so why not spend a couple extra bucks and get one that's 100% and run that primarily? It also features the upgraded extractor spring, insert, and O-Ring.
None of these things are overly expensive. You should have a spare bolt at least regardless of whether you buy a Colt or an Olympic AR. So you really shouldn't even count this expense as "extra" ...
Also note that the RRA rifle's barrel profile is HEAVY. My two 16" RRA rifles are more front heavy that my custom 18" rifle, and that rifle has a 12" rail on it the other two have 6 and 9" rails. I am going to have the barrels re-profiled to make them lighter.