Charles, similar experiences here...
I bought the iGaging version and although it is plastic, it is strong enough to give repeatable measurements.
What I found was that after playing with it a few times, I have not used it for any of my setups...router bit height, TS blade height, etc... It just hasn't been necessary.
I did use it to check jointer blade height but did not have the need to adjust them...so it went back in the bag and still there (battery dead, of course).
It seems to be handy for measuring for precise requirements such as metal milling but hasn't seemed to be necessary for wood projects or equipment setup.
If anybody feels they need an instrument such as the Oneway, I would instead suggest throwing the money away on any of its alternatives and try it out first...then if they like what it does for them, go for it.
If anybody is interested in this type of tool and already has a dial indicator and base, I suggest they replicate the functions first with that...it is much more versatile as the gauge and base will allow for other axis measurements that the Oneway does not. I have a Starrett gauge and base and realized that buying even the iGaging version was not necessary.
Mileage varies...