It's not really fair to say that Purina is bad. As someone at the Rabbitcon said (at convention), feed is always changing to some degree...doesn't matter what the brand...Purina, Manna Pro, Pen Pals (the national brands) are milled indifferent mills across thecountry and depending on the time of year they use different cuttings of hay in their feed. You feed what works for your rabbits. Now, I do understand that some years back Purina changed their formulaand some people weren't happy with the change. The person at convention who explained all this said that no matter what brand you use,the most important thing you should do is read the feed tag attached to the bag you're buying, and don't buy feed that is more than 1 month old.