Should be OK, but deterioration of electronics and rubber seals is more time-dependent than use-dependent. See if you can check the meters against another meter (either handheld or built-in) that you know to be working well, and lightly touch the rubber seals (such as the one under the screen against which the mirror comes to rest) with your finger. If any seals feel sticky or do not rebound when you press them lightly with your finger, they need replacing! As a rough check, open the camera back, place a piece of white paper over the film gate and observe the camera from the front with lenspaper from the front with lens removed when you fire the shutter at various speeds. If you don't see a perfect rectangle, this could indicate that the shutter is tapering (not opening until partway through its travel). If the cameras pass these rough checks, I would agree to shoot a test roll with each before photographing anything important!
Regards,
David