What's fascinating to me (as a weasel-y marketing type) is the reaction in the gunblog world to the R51 and the G42. The R51 is pretty much "oooh, shiny!", and the G42 has been "Yeah, but why not make it 9mm?"
The fact is, the target market for the G42 isn't gun bloggers or gun forums or 99% of firearms media. We know how to shoot, and the G42 is a great defensive firearm for people who don't like guns. It's going to sell, and sell quite a lot, it's just not going to sell to people who read or write gun blogs.
With the R51, we're seeing an entry into a market that we thought was saturated totally re-invigorate that market. Everyone and their dog has made a mini 9mm over the past few years, but despite that, the R51 is making an impact on people because of price point and design. I'm really curious to see if/how it's new/old design improves muzzle flip and felt recoil, and it has a design that appeals to the style-conscious.
Glock followed the conventional wisdom with the G42. Remington did not, and they just may have a something that will change the game like the LCP did for Ruger.