From what I see across the forums is that Uberti makes a superior Remington and Pietta makes a superior Colt, that in reverse there are many little things to fix.
I wanted an Uberti Remington for Christmas '03, but the $199 with free starter kit (nearly worthless unless you have nothing) and free shipping from Cabelas (being a Pietta) easily changed my mind.
And what I found with mine is the typical way undersized chambers (0.446") which were reamed to 0.449" and chamfered, a hammer face too wide to securely engage the safety slots that I filed and sanded to fit, a loading window/port improperly designed making it impossible to load conicals/bullets that I ground and sanded to use my custom bullets, hand and stop with sharp edges that I smoothed slightly, grip panels that didn't fit well and where a bit large (both historically and firmly smaller hands) and with a reddish stain I don't care for so they were sanded and stained, and a front sight I can't adjust as it shoots a few inches to the left at 15 yds. I've also heard of a few accounts in which the sight and/or lever catch have fallen off.
I'd assume a Pietta Remington would still have way undersized (my understanding is that Uberti has ~.450" chambers compared to both haveing a ~.452" bore) chambers and maybe I'll fitting grips, buts that's about all I read complained about, unlike an Uberti model. I'm speaking of the newer models.
My Pietta shoots pretty well. Where I get about 3-3.5" groups at 15 yds shooting offhand with my Ruger, I'm getting about 3.5-4" groups with my Remington. But then I'm no pistolero and I use an adjustable rifle measure marked in 10 grain increments. I've only tried powder charges by ~5 grains starting at 25 grains as my guns are for hunting and I require a fair amount of oomph to feel comfortable that they have enough velocity/energy to be humane using modern cartridges as a guide. And that goes down a different topic...