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It's really hard to say about the noise as those sort of things seem crazy subjective, but I reckon I'm more sensitive than most to noise but as it's only on for short bursts I can pit up with it. We have it under the sink and I put some noise dampening stuff in there and it helped. The sound of our dishwasher filling is louder than the pump anyway so that's not an issue and generally if the living room door is closed it's never really an issue.
As for the cost of use there's no way it doubles our electricity bill, I couldn't tell you how much it uses but I haven't noticed any real impact on bills.
When you say noisy - like if you have it in a cupboard, is it going to ruin you trying to watch a movie while the washing machine/dishwasher is on?
Also interested in electricity bill impact - one reviewer mentions bills doubling but that sounds insane