I looked into the same question and concluded that they should be fine, although ultimately I ended up with a Rebel X (no gadgets at all and even cheaper, but a newer body with perhaps some metering upgrades and so on). I mean, they all keep the dark in, right? Unless you have specific needs---say, for extreme shutter speeds or unusual metering modes---I think you're fine with any EOS body.
-NT
Good morning, Nathan, and Tim;
May I quote one comment? "I mean, they all keep the dark in, right?"
Well, with the Canon EOS Elan, that may be open to discussion, but for an odd reason.
With normal films, there is not a problem. However, with Infra-Red sensitive film, the Canon EOS Elan does have an IR LED system used with the film sprocket holes to control how the film is transported, and that IR LED in the EOS Elan body does tend to fog IR sensitive film. Again, this is not a problem with all normal film use, but it does become a question if you intend to use Infra-Red film for landscapes and other unusual applications.
Yes, I do happen to have an original Canon EOS-Elan body or two here also. This has allowed me to use my lenses purchased for the Canon DSLR cameras with film also. And, as others have pointed out, that deteriorating foam issue with the original mirror bumpers and the shutter blades is a real annoyance, but once it is cleaned, and the bumper foam replaced with a more modern and durable substitute, they do work well.