Quick thanks to Ken and Alzo Digital for the help and support. I had a small issue with my purchase which Ken took care of immediately. As I had written to him at the time....'this is a product I love'. In reading some of the other reviews, I'm also using this for DSLR negative 'scanning'. It's PERFECT. Prior to finding the Alzo macro table, I had a heavy duty tripod and head, over a table. The footprint was cumbersome to say the least. This fits on my workbench neatly, allows for adjustments to happen easily and comfortably--- and frees up the floor from the tripod.
In my setup, I've added a small Manfrotto ballhead for an added layer of leveling, and I have a Nikon D800 with 105mm Micro lens. The support has no issues with that setup, although best practice is to always have a hand on the camera for support when the lockdown is loose and you are adjusting the height.
I can't recommend this product enough.