I am a HAF 932 user, though it has a very very good ventilation, every 1 - 2 months i cleaned my pc, and there are rarely dust gathered besides the one in the fans.
HAF 932 perfectly suits my gaming needs and parts and for future lasting 😀
I just built a system with the FT02. Can't speak to the 932, but the FT02 has been great. It has a nice clean look. It's conservative.. kinda like a macbook vs an alienware laptop....
Airflow seems very good and the case is a positive pressure design to minimize dust intrusion. I also found it easy to build with, though the back (side) panel is close to the mobo/backplane that you have to be careful with your cable management. All in all very happy.