Petzl saddles kik butt . I had a Navajo for several years, and for straight ahead tree work that saddle was hard to beat. Lightweight, efficient, and comfortable, hard to go wrong. The single D bridge works like a charm, do not be put off by the lack of a 'bridge' per se, the Navajo does not need one.
But....the Sequoia for a fair bit more cash, is a damn great saddle as well.
Did a quick take down today in it and was reminded again how much I love the Petzl saddle.
The back support in the Sequoia is awesome.
One thing I was not impressed with was finding out after having purchased the saddle(used mind you)that it is not Ansi rated as the rings are only rated for 15 kn, much like the ZigZag, was not impressed with that much, but cant do much about it now.