I got the collection a little while ago and went through them in 2 days flat. They were really good and I highly recommend them. I have plans to post some of them later on, once I have the time.
I tend to think of DCAU!Tim as not so much a Tim and Jason but as Tim, Jason and Dick because he's Robin. There's no other way to describe it. He's acted like all of them in turn and has aspects of it all. If Robin were a person, he'd be DCAU!Tim.