Product review (5 stars): I recommend to all my client KOBE hoods
I recommend to all my client KOBE hoods. They are much quieter (40 db at low speed), more powerful (700+ cfm, and under 6") and easy to clean baffles. Well done KOBE.
The look is up to you. For me it is clean, simple and the rounded corners are well executed.
I am not aware of any issues with hardware since we use carpentry/wood screws to mount them. The duct work should be done by an experience roofer or someone experiences with roofing and sheet metal.