Clatter and squeak is not good on a Canon. Ask any AE-1 owner. But a good clean and lube should keep it running for many years. I keep trying to get more FL lenses, but other things get in the way. Camera gear searches go in cycles though, and sooner or later I'll complete the set.
ps: Clicked on your link, but I don't do Google +, so couldn't look at anything.
My local shop, Peter's Camera, refused the work on my Canon FT. I do have a quote from another state for less than $200 and a backlog of 4 or 5 weeks. (Peter also turned down the work on my Electro 35 GSN, but but he did clean a Mamiya C3 shutter and repair the speed setting that I broke.)
The Canon AE-1 has much of the same iconic appearance as the FT, but I read that the material construction is very different. The FT feels like it's been carved out of the metal. (And my EOS Digital Rebel, EOS 650, and EOS Elan II are simply not as iconic or as fun.) I believe you, though, that the refurbishment issues are similar.