Thanks guys for the immed and useful info, eh? Was able to walk into the dealer with said info and carry on a decent conversation, asking the "right" questions.
Seems that up here in the land of ice and snow, the valve/sensor unit costs $120 retail, and another $60 to take the tire, install the unit, which ended up a hair short of $200. Let's see, that's $600
the remaining valves to be replaced down the road...hmmmm?
Personally, I'd turf the valves/sensors, and go with the reg valves, checking the tires every two weeks or so. These opts are more of a convenience than a necessity (IMO)...but, they at the branch "warned" us that she'd have to sign a waiver, acknowedging the fact that the sensors were not there any longer. A scare tactic on their part? I can't see a meaningful use of such devices in say in a blowout, or the need to replace tires because of low presssure. In the first case the sensor may not act in time, and and in the second, negligence is more the cause.
Anyways, thought to share this experience if you find yourself in a similar situation either of having a vehicle with this sensory set up...or a young one who has one.
Again, thanks for the quick shares...but that's what this site is all about! Helping each other.