I'm another Juki2010Q owner and happy... Great machine but it doesn't like linty thread and the bobbin area and feed dogs have to be kept clean of lint or the tension acts up. Other than that, it's a wonderful, strong machine.
I have sewn on many commercial machines as a commercial seamstress, and those big motors are noisy. You have to turn the motor on first, before you can start sewing. I wouldn't want such a beast in my home. They also have to sit on a vat of oil, and "wick" the oil up as needed. It's not the best set up for in home use.