Lets add some newer comment to the (old and excellent) reviews. First ; Quetzal is very peculiar.
Not just her appearance. Her ability is downright amazing. But, unlike Kit, it can sometime be competely useless. Quetzal ability let you run through a lot of barrier without inconvenience. If you use criminal tools with Quetzal, like Boomerang, Barrier will never be a problem.
The thing is, with Paperclip, barrier are seldom a problem. With Quetzal, it is probably better to use Corroder (2 cred cheaper) and save a cred on breaking barrier by using Quetzal ability. For certain ices, like Sandstone, Vanilla, Static Wall, Rainbow and other, Quetzal will let you pass the ice for free! Major saves.
But certain corps use more sentry and code gate. There, Quetzal become useless.
Which is why Quetzal is often hosted on DJ Fenris, to get a cheap breaker for barrier, that work once a turn.
Finally, Quetzal is most colorful ID out there. In all variation, she has this quality that fascinate the eye.