Gene -
I have a 25 Cruiser and it came from the factory with a rear steering station (no throttle controls). I didn't find it terribly useful without throttle controls. Maybe if I fished out in the ocean with more space between boats I'd find it more useful. With how crowded the Columbia / Willamette can get, I never felt comfortable being that far way from engine controls.
I spent quite a bit of time researching how best to add throttle controls to the rear station. I have the worst possible engine setup for doing this: twin Honda 90s with mechanical throttle/shit controls. Switching to electronic controls (ex. Teleflex KE series) was an option, but it would have been very difficult to find space for all of the components that make up that system (control modules, actuators for each engine, etc). It was also about $7-8k. I ended up going with Kobelt mechanical controls for about half that price. Both rear and main helm controls had to be replaced since it works in a master / slave setup.
I single-hand most of the time so having the throttle controls back there has made docking / undocking quite a bit easier. Visibility is the main issue with the rear helm station. When standing up, it's just about useless since the cabin top / radar arch / etc blocks most of the forward view. I've found that if I sit on the gunwale and open the door to the head (it blocks a large portion of the visibility to the port side), I have a very good all-around view. I still wouldn't use it for anything but displacement speeds.
One additional caveat I will throw in here is about the 2nd hydraulic steering station. I've had a persistent problem with air in the system, even after power-bleeding with the Teleflex professional bleeder numerous times. Both helm pumps are new so it's not an issue with any leaks / seals. I've had a few different shops look at it and they can't find anything wrong. One shop discussed it with Teleflex. The one Teleflex engineer told us that additional helm pumps were not designed to be at the same elevation. Having a 2nd helm pump on a fly bridge for example gives air the ability to rise and be bled properly. Having the 2nd helm pump at the same level makes it very difficult to get all the air out. I've never heard this before, but I'm starting to believe it.
If you ever want to check out a 25 with rear station, I'm not far from you.