I've been using Scratch and Peck feeds for the last four months. I'm still on my first flock, so I don't have a lot of experience (i.e. over the years where I've tried multiple formulations) but mine have seemed really happy with it so far. I used the grit, chick starter, grubs, and grower so far. I only have one of my eight laying right now, so I'm still using the grower. The grower is 17% protein, the layer drops to 16%. I've seen others talk about 16% being the minimum, so Scratch and Peck is riding the cut line there if that is important to you or your flock. They are based out of Burlington, WA, which isn't real far from where I'm at. Consequently, a lot of the area stores carry their full line. It averages about $30 for a 40lb bag around here. Anyway, I sure can't complain, it's worked well so far, and knock on wood, all my girls seem quite happy, healthy and plenty of energy. I don't have any plans to change anytime soon. Hopefully others who have used it longer can chime in and give more perspective for you.
Just as a side note, I have no idea if certain breeds of birds do better with different levels of protein, but you might want to mention the breeds you have in case that comes in to play at all. I have EE, PBR and RIR. My PBR has been the first to lay, and I'm supplementing the feed with free-feeding oyster shells since I am using grower and not layer.