The Canon AE-1 was a very popular model up to the early 80s before the Canon Autofocus EOS cameras came along.
They are good cameras. I believe that a common issue is shutter squeak but I don't know if that is anything more than annoying.
This camera uses lenses with the Canon FD mount. All manual focus. The good news is that these lenses are easy to find on the used market, and are fairly inexpensive. The bad news is that FD lenses are not compatible with newer Canon EOS cameras (autofocus).
Try the camera out, see how well it works and if the meter is working. You might consider taking it in for a CLA (clean, lube & adjust). If it's in good shape and you have some good lenses...there is no reason it can't give you years of good service.