I've used fermented feed for our CX batch last fall. Fed 'em treats daily, fresh greens, yogurt, mealworms, bugs the kids caught, worms from the garden, etc. Frankly, the taste is so similar to grocery store birds, not sure if all that effort yielded different results on the palatte. In terms of quality of meat, yes! But in my mouth...not so much.
However, my layer flock does taste different to me - partly because they're typically older birds being culled - but I also believe because it's a different breed of chicken. I like the taste of the FR's better than the CX. Husband cannot tell the difference. Teenage sons simply inhale whatever is on the plate in front of them, so their opinoin doesn't count yet! Since I'm the chef of the family, we're getting more red broilers this year if I can find them in limited quantity. Not doing 25 again. Simply too many roosters all at once. Now, 12, yes, we're on board!
Fermenting feed is not difficult. The challenge is to keep it fresh, by only putting in what you'll need in a few days. I made the mistake last fall, as the broilers were being processed, to refill the 5gal bucket. I only had 13 birds eating out of it. The feed grew some mold which I didn't feel comfortable feeding them, so I removed the top 'skin' of mold and feed and used the remaining. The bucket has since frozen, due to weather, so it'll be interesting to see what happens when it thaws, come mid April! Do give FF a try. It really helped with minimizing the 'ick' factor. Hugely. I won't do meaties without it!