I’ve always heard the opposite. The gears in the brush pro are metal and last, that’s one reason they are expensive.
manufacturers just relabel from the same Austrian manufacturer units
The Austrian machines are the real deal
And will last long time (but)!
if you use corrosive stuff (for example floor stripper) they die!
constantly spray the bearings with WD-40 and wash out the grease they die!
if you treat them like they are a heavy duty floor machine toss them in of out of your truck they die!
run them in a foot of water they die!
Leave them on the brushes without the tray (so they hop around) they die!
People just don't treat them like they cost two grand and are made of sheet metal!!!
They need wiped out after every single use!!!
If they start to make a bearing grinding noise replace the bearing before it meltdown!!!
Treat them like a precious little baby. They will last
Another reason is they buy the cheap ones by strong dry that are Chinese Austrian clones and fall apart
Now strong dry uses to Austrian built
Sorry this is a sensitive subject for me I guess I got triggered my rant for the day is done