Tool Holders for Spindle Users

Looking at auto tool changers and came across this:
ER-20 Tool Holder
Anyone use this style of holder for quick-“er” tool changes with their spindle?

I have not used one, so below are just some thoughts that came to mind.

I would be curious as to the specs regarding balancing/TIR. I could not find any details in the catalogue.

You were correct to add the ‘er’ qualifier to ‘quick’.

The thought of using set screws to secure an endmill makes me uncomfortable.

I might invest the high cost of this into high quality precision collets.