The only potential negative I would see to the AZ-EQ5 over the older style EQ only mount is that it looks like the clutch design is the same as the AZ-EQ6. They are not a problem in themselves, but for astrophotography use the design makes them harder to balance as the payload sits on the Dec clutch and to a lesser extent on the RA clutch.
For my Orion Atlas Pro (An AZ-EQ6 with a coat of black paint) I found that to balance the Dec it needed to be rotated to a counterweights high position to keep the clutch from dragging, and the RA needed the mount set to 0 elevation to get as much weight of that clutch as possible. Nothing impossible to manage, just a little more fiddly than the EQ clutch design.
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