Red factors are very interesting.
I personally don't really care for them and find their appearance a bit jarring.
However, I guess that sometimes an otherwise normal looking grey will sport a few red contour feathers, which is pretty neat.
I follow a lot of grey owners on Instagram, and it's always a special little event when one of theirs gets a red feather.
I worry about possible health effects of breeding to get all-red greys. Like how many breeds of dogs have serious health problems that have been passed down and amplified through breeding to get specific characteristics (like how Dalmatians are often blind, and German Shepards have very bad arthritis in her back hips).
Just something to think about, I guess.