Spindle Speed Controller Question

[JAZZCNC]

I've used high quality air cooled spindles for years with no issues, running 8-10 hours a day, 6 days a week. HSD spindles with electric fans for over 10 years at a previous job.
At my current job, we have a 10HP spindle that's cooled by the dust collection airflow. It's been running full time for over 8 years now.

I own a couple air cooled chinese spindles, but haven't used them yet to see how long they'll last.

Yes Gerry but that's not comparing Apples with apples. High quality Air cooled HSD spindle is different Animal to the cheap Air cooled what's been talked about here.
In my experience at the price level of the WC spindle NOTHING comes close to comparing and only fool would buy Air cooled at or very close to same money has WC.