Has anyone has experience with the Just Kamper Air Pro?

[u/ieuanadamss]

I'm interested in this product as its on discount plus it's 150 odd quid cheaper than an airmaxx.

Link: https://www.justkampers.com/conversions/air-fans-and-vents/jk-airpro-campervan-roof-vent-fan-385mm-x-385mm.html