The only thing I know of Nutriberries is what my vet told me. I used to feed them to Peaches, but she is also on the Harrisons. The vet told me not to feed her Nutriberries anymore cause they have had complications with the two with other birds.
I'm sure they have good things in them, but nevertheless, it's processed and just like with human foods - processed food has additives, preservatives and loss of nutrition in the processing phase.
Also, ANY food that has 'coloring' in it, whether it be pellets or treats - has dye in it. Studies have shown an increased chance of liver & kidney problems in birds with prolonged use of colored foods. Not that you should never give them anything colored, it just shouldn't be part of a daily diet regimen.