Yea, mine is noisy for a few days after a clean. The prefilter seems to trap air. The noise is grating. Giving it a good thump seems to help.
It's a good filter, though. I like the combination of media. The water always looks sparkling.
The only thing I would urge caution about is the flow rate of the 2075. It's a bigger filter, true. But the pump has exactly the same power rating as the 2073. According to my admittedly limited understanding of filters, if you attach more baskets to the same filter, the flow will be reduced. Yet the specs claim the 2075 has a better flow than the 2073. It seems counterintuitive. Granted, it's just one extra basket of MechPro. Nevertheless.