Great Cams for their job.
Let's get the negative out of the way. They are wider and less acceptable to side loading than CCH's Aliens. (Hence why I've got 3 aliens on my rack too). That said, I use these about 5 times more often than the aliens.
Why? Well, I climb mostly in the Sierra, and our cracks aren't that squirly. Almost always, I can throw in a TCU, and I rarely ever miss the sizeing, they jut seem to work. The color coding is intuitive and bright, the triggers work great.
I love everything about these, and don't think a rack is complete without 00-3.
Do note, as well, that 00 has somewhat a low strength rating, like all small trad pro.