My Tobi LOVES his red kong toy!!! If you put some of his regular food in it with a bit of peanut butter on top they'll be occupied for at least 20 minutes! Tobi didn't care for it at first (when it was empty), but once he discovered the yummy goodness inside he just fell in love!
The kong toys are also great because they're so durable. You just have to sort of train them how to use it...I did this by holding my kong toy like an ice cream cone for Tobi, then put it down so that he could enjoy it on his own.
I think that out of ALL of Tobi's toys (and he has LOTS), the red KONG toy is MY favorite and his.
