Hagen makes very good pellets.

Him liking them in the most important part!

We used to mix the Hagens and Zupreem and eventually Casey got to the point where she would eat all the Zupreem and refuse to eat the Hagens so we just stopped offering them. We still buy the Hagen Tropimix for the occasional treats though (I wish it came in a smaller bag!

)
I've heard from someone who used to test different pellets that Hagens were one of the best, but I've also heard they spoil faster so just make sure you store them properly and don't offer more than he can eat each day (usually between 1 to 2 tbsp)... once they go bad they smell really really bad, and loose their fruity smell.