I have been helped by both bojan and gary (and others) in setting up my DIY alt/azimuth for my 10" LB. working well now thanks.

In this situation there is no right or wrong, only opinions.

as some others have said.
My view is that the Argo Navis sounds like a quality item with many happy owners, but I wouldn't spend that sort of money on an accessory that costs as much as my telescope. My aim would be to put the money towards buying the best telescope I could afford, than the best accessories that I can afford can be added as need be.
It's like fitting heated leather seats with multiple motorized adjustments to the previously mention Lada in my opinion.
Although if I was to find an Argo Navis under the Xmas tree


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