Wow! I'd never even heard of an AT-1! It seemed like everybody around where I lived at the time was either selling the AE-1, the AE-1 Program, or the A-1. Now I see on Wikipedia there was not only the AT-1 that you had, but also an AV-1 and an AL-1. They all had the same bodies and lens mounts but slightly different features. I never knew!
Yeah, I think the AE-1 was probably more popular in the UK at the time (late 70s), but I liked having all the control (and I couldn't afford an AE-1). But what I really liked about Canons was how chunky they were compared to Olympus and Pentax - it made for stable shooting.
A bit later I got a Nikon F3 for work purposes (paid for by work), with lots of goodies (ring flash, macro lenses, etc.), but never really liked as much as the Canon.
