I have a RZ67II with the 65mm and 110mm. I've also liked the 50mm for something a little wider. I also think the 250mm is a killer portrait lens especially for outdoors. You can take head shots at F16 and still get a creamy background.
That being said, it's not a walk-around camera. It stays in my bag until I see something I like. Then I take it out and stick it on a tripod.
As far as the AE Prism, I thought about it and turned it down. And actually I like seeing the image through the WLF. You can view your composition with both eyes which I find very nice.
As far as reliability, I've had no issues thus far. I image it will need a new battery at some point, but the camera is still light tight.