I think you'll be pleased w/ them. Based on the shade of eggs I'm getting in the second year from my EEs, I suspect these will darken as well. And thy are neat looking birds to boot -- lots of colors. I'm going to be picking up chicks in a couple weeks, and I think I may get some of Dr Whiting's green layers, too, and put those in w/ my EE rooster.
I really enjoy the EEs ... you just never know what you're gonna get when you go to check the nest box!