When we bought Orontes II, I installed four Caframo Bora fans based on Practical Sailor's comparison. I soon had several problems with failures, all of which were in the switch. Even two replacement fans (replaced by Defender since the failures were within 30 days) failed in short order. Unlike other posters, Caframo stood by their products and replaced every single
one. I spoke with one of their QA folks several times (each time one failed) explaining the problems I was having. She explained they were redesigning the switch and the new design should solve the problem.
Since the last replacement I have had zero failures over the past four years. I installed a fifth unit in the galley
about a year ago, and it gets used an hour or so a day. The three fans in the berths get 8-10 hours of use each night, and the one in the salon
maybe an hour a day. Most of our usage is on low speed. These units move a lot of air and the higher speeds are not needed very often.
I'm very happy with the fans I have and with the support I got from Caframo.
I had Hella fans on our previous boat. I found the Turbo to be a very good fan and almost silent on low speed. I had a lot of trouble with the smaller fan, maybe it was the Jet but I can't remember. This was 17 years ago and details escape me.