I use an adapter from Big_IS and it works fine...but...

Exposure/meter reading CHANGES NON-LINEARLY....that is, with the aperture wide open the correct exposure (on the EV scale in the VF) is NOT the same as when it is stopped down...it happens that way with every MF lens of every brand I've tried (Nikon, Vivitar, Olympus...) on my Canon EOS bodies.

As for using the focus-confirmation chip....the newest generation do a better job than the 1st dandelion chips...with the 1st gen. some lenses were in focus when the LED came on from infinity, while others were "spot-on" when focused from MFD...and the LED stayed on during too much focus barrel rotation...so.....
...as you can imagine, I don't like the AF LED....too distracting/undependable...so I just depend on my lying eyes...