I started feeding my birds pellets about 5 months ago. I used to feed them seeds along with veggies, bread, rice, etc. but I felt I should start with pellets too. I got Zupreem but they didn't touch it. After much efforts, I went and got Kaytee. They LOVE it. My birds are very open to trying new foods, however, with seeds and pellets, it HAS to be Kaytee and nothing else. They protest if it isn't Kaytee! They love Kaytee pellets. Now that they are doing good on pellets, I think I might try Zupreem. The Zupreem pellets they sell at Petco looks similar to Kaytee Exact Rainbow pellets. They like Kaytee Exact (the plain one) better than the fruity one, but Petco was out of that last time so I ended up bringing the fruity one, and they were fine with it. They didn't like the Zupreem fruity one though. I asked this question on the Tiel Talk board I occasionally visit, and they said they believe the best are Harrisons and Zupreem, but added that Kaytee is good too. They don't sell Harrisons around here and there's only one type of Zupreem at Petco, but there is so much Kaytee variety everywhere here.