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I just bought 4 for $20 of the flat aluminum rings to keep on my manual AI/AIS nikkors. They get infinity and because I don't take them off/on, they tend to stay pretty tight (one got loose, but I just re-tightened all the screws)... I mean, I'd get the cheap ones and if they really don't suit your needs, you can replace them with better ones and you aren't really losing much money (plus you'll have a bunch of secondary back-ups).
All alloy adapters play after few months of use. Problem is "soft" material used to make them. Just spend extra $ for stainless steeel ones and do not be tight a....;-)
Honestly, they were the cheapest Chinese "F to EF Adapter" on eBay. I think they were $6-7 with free shipping, so I just "made offer" of $20 for four. I was originally planning on replacing them with good ones, but they've worked fine (and I've had them since 2008!)
They are tight to get on/off, but I rarely take them off (just make sure you lift the pin-catch thing and it's probably more a lack of grip on just the ring-edge, than over-tightness, that's prevent their removal).
As for marks, I usually don't pull focus using the marks on still lenses, so I can't comment on the accuracy. I do get infinity focus a smidgeon early though. Further, I only have them on primes, not zooms, so I'm not sure how that affects their focusability or sag or wear (primes are really light). Truth is, I don't see how something so simple can be screwed up too badly... That is, as long as it's the correct thickness to achieve proper FFD within tolerance, how can the expensive ones be that much better ($5 vs. $65)?
Best "adapter" you can buy at any cost:
http://www.longvalleyequip.com/lensmount.php
Super strong, designed and built by an OEM to Redcine.
I was talking more about something like this:
http://www.ebay.com/itm/Nikon-AI-F-...t=US_Filter_Rings_Holders&hash=item1c295e52c7
And then buying a few to get a "bulk discount". NO iris control on these (hence, "dummy" mount). Again, if you're not in a super big rush, why not buy one or two and see if it handles the way you want.
I used a lot of these for Nikkors to EF. Started with the Fotodiox "no play", ended up with cheap eBay chinese adapters - they're fidgety to swap out on set and I went with the "every lens" scenario. Really no issues with the cheaper ones. If you're shooting every single day, they may wear out faster than my several days a week/month schedules. But if you're using 'em so much they wear fast, keep replacing or buy something pricier. But I found the quality essentially the same from $18 to $80. I shoot a lot of still gigs, but I don't use as many lenses for stills as I do for motion, many of my older primes went months with adapters attached.
If you go this route, remember to buy a bulk pack of EF rear caps!!!