Yes. I have. Used it for a couple years and finally got the spindle. I have no experience with programming vfds so I opted to get their setup. I know I could have spent less doing it myself but, wanted minimal downtime. Tramming takes long enough.
It's great for the sound and accurate feeds and speeds. Cuts much more reliably and since your gcode controls the speed throughout, it is a better experience overall.
That does not mean that I didn't have great results with the router. I have a 4896 in my basement and now the vacuum is louder than the spindle. I really love how it steps through words and feeds calculated correctly instead of listen and tune sorry of setup.
I will say that I learned more than I would have if I only used a spindle. Having to understand the details of everything with the router made the spindle trivial. It also made the experience something I now enjoy more because I didn't understand the difference at first. If you do upgrade eventually, you'll understand. If this is your first cnc, you have lots to learn anyway. I spent so much time understanding the tool and how to write a better post processor for my needs. It has been about 3 years and I've been able to increase my capabilities drastically over that time.
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