Another Zephyr owner, here. It's also my first "real" steadicam, but I've used tons of lesser knockoffs for years. I'm glad that time is over with!
Like most here, I love my zephyr. I got the standard vest, because to me it felt better. I fly RED MX, mostly- and Epic soon, I guess.
I'll be using it with David Allen Grove's rickshaw later this week on a short film I'm directing. Which points up the only downside I've had with the zephyr- the socket's just not the same as the high end steadicams. It's a pita to deal with, but hey- for what it is, it's great. And I see the zephyr as a real bright star with the lighter high-tech cameras out there. I can get into places a big rig would have problems with.
I have been told by a couple of guys that I should replace the stage with a full-sized one. Not sure I need to, though.
Mark, I was also surprised about the safety stop. I see a hole for it, but nothing came for it. Ah, well. Thanks for the tip on the aux battery hanger!