I purchased both Rock Island Armory 1911's for about $450.
Now, I will say that both have been flawless out of the box, but they are not a high end 1911, naturally.
That does not mean that you shouldnt purchase one given your price point, but do not make the mistake of thinking that a Rock Island 1911 is going have a service life of probably more than 10,000 rounds before needing a barrel replacement, lug, possibly a new extractor and tuned, and other working parts that may need to be replaced. At the point you'll spend about as much as purchasing a new Springfield TRP.
They shoot well enough for home defense and are fairly accurate. I see them as an intro gun to the 1911 genre prior to purchasing a more expensive Springfield or higher end 1911.
Just my .02
"When a government robs Peter to pay Paul it will alway's have the support of Paul" George Bernard Shaw