I have sevreal 700 actions that have been blue printed, and I have several stiller, 2 bat actions, and I can promise you if done right you can't tell difference between the 2, and one my 700 is on a F class gun. But good luck .
I never said you couldn't bring a remington up the standard of good custom actions, just that by the time you do it will cost more than the custom. If you just want to face the action and lap the lugs then it's cheaper and it'll usually shoot very well. However, you run the chance of running into other things like crooked scope mount holes or no primary extraction like I did on my last remington and have to fix that too.
Of course some custom actions aren't up to snuff either. I've been able to avoid that so far but hear stories of it.