I got it used, supposedly only 2 months but I doubt that. I'm not using the plastic cover, I prefer to see the pump and tubes, I like it's ruggedness compared to more modern ones.
The vibrating/hum may have just been caused by not securing the pump properly with the screws. When it was noisy it was the body of the pump, not the impeller/shaft rotating. When I ran it last, the noise was what I would consider normal for this filter.
I've read that the 1260's flow rate can be increased by swapping a part for the 1262 version. I think they call it the 'volute', the piece that covers the the impeller chamber.