I bought a factory-length LWD barrel for my G20 a few months back. Reason was, the factory Glock barrel was going through brass pretty quickly. I figured I'd get more reloads out of the brass with the tighter chamber of the LWD barrel. The LWD barrel is more accurate than the factory G20 barrel and there's significantly more chamber support @ 6 o'clock.
I had to start with new brass when I got the LWD barrel, as the brass that'd been shot through the factory Glock barrel wouldn't feed right, consistently.
Here's a comparison between the LWD barrel and a KKM barrel. The Glock factory barrel has
significantly less chamber support than either of these.