I have the 70-210 beercan although I never used it a lot since DH thought I needed the 70-200 f/2.8 for my BD shortly after I got the beercan. I wasn't exactly going to say no!

I do have and use a few of the Maxxum lenses and my one comment would be on the CA that is more likely to occur (and which I haven't gotten good at removing in post processing). My understanding is the coating on the lenses were of course not done for digital so you can get that effect - but it's not always prominent and depends on what you are shooting. I really ought to try the beercan on the A77 and see what I get. I do use the Maxxum lenses on the NEX a fair amount because of their more compact design compared to new lenses. I really liked the 100-200mm f/4-4.5 and used it quite a bit but mine was smacked around when DH was gathering stuff in case we needed to evacuate from an oncoming wildfire last winter.

I haven't test yet to see if the hole at the side of the lens is going to affect the picture or not.

I saw a comment to you about resolving power but IMO there are many of the Maxxum lenses that easily hold up in that regard and would expect the beercan to be one of them.