I have an Armscor (in my case a High Standard), which is for practical purposes a RIA. I also have a Tisas, which is a Turkish manufactured.
Both are 5" .45 acp government models, with little, if any, refinements. Both have the standard milspec sights, nothing to write home about. The High Standard has a parkerized finish and flat mainspring housing, the Tisas has some sort of black paint job and an arched mainspring housing. Neither came with pretty grips; I got the High Standard used with green Hogue rubber plates, and I got the Tisas used with the stock smooth wood grips.
Both feed .45 fmj without issue, using the various mags I've got... this includes one Chip McComick Shooting Star mag my brother gave me, the MecGar 8 rd mag that came with them, and a bunch of cheap Sarco 7 rd milspec mags.
Re the Sarco mags, I took some online advice and disassembled/cleaned them, and they run fine now.
Someone on ebay was selling Remington factory second double diamond grips for $12 apiece, I bought 2 pair and put on both pistols.
My brother has a pair of Colts; a Series 80 and a USGI Reproduction.
For shooting purposes, all seem about equal in our hands, and I've shot some of his HP ammo through my guns without issue (just several mags, so I can't swear to perfect function with this small total). But frankly, 7-8 rds of 230 grain .45 ball should suffice in most situations.
With my range fodder: Magtech, Freedom Munitions, Blazer Brass, S&B- all quite reasonable accuracy, once you get acclimated to the 1911 (I usually shoot 9mm DA/SA, used to a bit fatter grip and a different trigger). Good enough to hit neon plastic coke bottles at 10 yds for me. For useful shooting enjoyment, they all seem alike, with the Series 80 being the most annoying- the front safety is loose and wants to fall out.
My overall take on them:
none of these are true US surplus pistols with real history attached to them. My two foreigners each look reasonably close, for less than a 3rd of the cost of the Colt replica.
I think that both bargain guns are 'true' 1911's, unlike in the past when you had things like Llama's that didn't share parts with the 'real' ones. I've changed springs, and swapped parts back and forth with my brother's Colts, and they fit and run fine.
If you want the satisfaction of owning a "real" USGI, get a CMP- for about a grand. If you want the satisfaction of owning a precise, hand-fitted firearm, get a custom make- for more than that. If you have brand loyalty, go ahead and get the brand you like.
But if you want a functional, reliable shooter 1911 for a reasonable price, these fit the bill.