As I'm sure you know, most will encourage you to stay away from the quiet cut spindle. I had the 400w brushless spindle and now the makita rt0701c. The rt0701c is louder for sure, but with much more grunt. Depending on what you are cutting, once your tool touches your material, the difference in sound of the motor running without cutting becomes a non issue. If you only ever wanted to do light work then the quiet cut isn't a bad choice.
The Chinese spindle also burned itself up, but I live in hawaii so I attribute that mishap to the humidity. I dis sure enjoy the easy pwm interface on my brushless speed controller. Not sure how yours would be.