I have the 508SS. I love them and the birds do as well. My greenwing actaully is growing a tail! He has enough room now he doesn't smash it.
I loaded up the whole gang all at once for a vet trip - a two hour ride and the new travel carriers are absolutely awesome!! I am thrilled with them and getting two more so everybody has one. I hauled the whole crew and it was so nice to have such secure carriers. I put the guys in the old plastic ones up front so I could keep an eye on them. I used to worry about the chewers getting through the plastic carriers. These are absolutely awesome.
Thanks for having such great stuff for my family!!