I have a recently acquired Cameraquest adapter for my MF Nikon lenses. I guess I'm old school, I like shooting manually and stopping the aperture ring on the lens. For the past couple of days I've been testing the adapter with a Nikkor 28mm 2.8, 50mm 1.8, A Tamron 70-300mm and Tokina 70-210 and I like the results. Like a previous poster on this subject said... Good glass is good glass. I am considering getting the Oly overpriced eyecup to help my 40+ year old eyes.
If you like the idea of taking photos with legacy equipment, I would say give it a go, having more tools in the toolbox isn't a bad thing. Plus you can always take your old camera with you as a backup should your new technology fail when you're miles from home. Personally, I like the advantages of AF zoom lenses and use them too, but it's kinda cool shooting with the old stuff, the images are nice, and it keeps you sharp, ie. making you think when you should compensate in those difficult situations.
The only down side I've come across is with my 70-300 and 70-210 in their respective macro modes. For some reason the lens will only focus in a small area in the middle of the frame, leaving a lot of the frame blurred. I guess I can't have it all, so I'm going to get an extension tube.
When I bought the Cameraquest adapter, I was prepared to take a gamble to see how it performed. You can return it within ten days and only be out $20 or so. Mine's a keeper
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Eric