I too have been using an Oehler 35P for over 30 years, so I know that you are about as old as I am. My sympathies.The Oehler 35P (I've had one more than thirty years) is as useful as the LabRadar, it just takes longer to set up. My LabRadar has been used frequently in the several years I've had it. I've never updated anything and bought only a folding base for it. If I don't pick up a shot, it's usually because I need to slightly move the unit. Once I do that, it generally works fine.
Having spent 10 of the last 30 years living in Wyoming, I got tired of the Skyscreens blowing over. Where I shoot in Utah is also usually breezy.
So last year I bought a LabRadar. After doing my homework, I also bought an "Uncommon LabRadar Sight Mount • Ginger's View" off Amazon, and mounted an old red dot reflex sight I had. Takes the guesswork out of aligning the unit. The built-in mic seems to work well for me.
Caveat: Were I still living in Wyoming I suspect the wind would blow the LabRadar over too!