Residential water pressure booster operation & reliability
Supply

I'm not sure about that specific model, but it's not built in, you can add a 1-way bypass line so that you will always have some water.

Life Span

Lifespan should be in the 10-25 year range. Warranties are usually for 3-5 years.

Power Draw

It like other pumps in your house will increase in electricity cost.  I haven't checked actual the rating, but can imagine it will be comparable to a modern refrigerator.

Cost of Ownership

These should be maintenance free, so electricity is your main concern for CoO.

According to Stack Exchange guidlines I really shouldn't provide any numbers here anyways I don't know what you pay per Kw, nor is that price likely to be static.