I have a Chrony F-1 and a Chrony Beta Master with the paper tape thing. Probably have $300 invested (tripods, tape, extra long wires, extra sun defusers, etc.). Bought a Oheler 35 just before they were discontinued, and what a good move ! If the Oheler is more accurate with the greater spacing of the sensors, then the Chronys were indicating on the average of 40 fps higher velocities than the Oheler. I believe the Oheler.
If I had to buy another chronograph today, it would be the CED unit or if $$$ were no object, I would look at the new one offered by NECO, or an Oheler 43 (?) and not have to worry about inaccuracy. Having said all of that, anything is better than nothing IMHO.