Yep, Da Bird has been a huge success here with Jameson, to the point I have to hide it when we're not playing. Although now he knows where I hide it (above the hat rack in the hall) , and will sit and stare at it for ages and then meow at me to take it down. On few occassions I've seen him trying to climb to get it.
Da Mouse is also fun, but not even nearly as exciting as those Birdie feathers.... One tip: drag Da Bird around in the grass... it drives kitty crrrrrrazy!!!