I have an EOS 3. I bought it off of KEH for $149 to replace my 1973 Ashai Pentax ESII brass-body as my film camera. It is an outstanding well-built durable camera, the autofocus is great (I use the eye control), works well with a flash, and the viewfinder is excellent. The interface is easy to use, few frills I dislike, and plenty of features I do. I hate the battery, but that's that. I like it over my 40D for some things, but my 40D is still my daily shooter.
I have been shooting mostly Ektar 100 color negative using a 17-40L for landscapes and/or nighttime long exposure. I occasionally put a thrifty fifty (1.8 II) on it for a walk-around. I sometimes shoot a roll of Fuji 100 or TMAX for a change of pace, but I mostly buy 5-packs of Ektar 100.
I would highly recommend this camera and a cheap 50 or a nice wide-angle zoom to anyone who wants to shoot film (again, or for the first time). Between the body ($149), the film ($9/roll with developing), and a good but not great scanner that allows for 13x19 enlargements of sharp images ($175), you could shoot 100 rolls, or 3600 images, for the price of a used 7D. That doesn't sound that cheap, and truthfully it isn't, but it's about 30 cents an image, not a buck as some film-hater above claimed. If you do your own C-41 at home (Tetenal press kit?) you could make it cheaper. I intend to do this at some point, but I worry because it's a bit finicky.