I'm a tad late getting in on this... I feed prey model, too. I started last December. My dogs are doing great.
I bought another freezer - an upright this time - and it is full of pork, lamb, brisket, beef heart and chicken.
I just switched a 2-1/2 year old larger dog onto raw, too. It took a while but he finally came around. I think it is so fun to hear them crunching away on the bones.
I just feel like I am doing something really good for them and it makes me feel good, too.