we started on Excel light, and stuck to that for a few months, but were dealing with runny poos every other day.
He's been on SS for 6 months now, and there's only been 2 runny poos in all that time. His coat is dramatically healthier, which makes me think (realistically or not) that his insides are too!
I hear lots of good things about A & P, and would be interested to hear from people who've converted from SS to A&P, and if there's been improvement