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We have one in our house.
Pros - pretty much everything.
Cons - if you are on a well, or otherwise have low pressure, it may not kick on. It needs a certain pressure to kick on, so you may also need to a get booster or well tank system. If pressure isn't an issue, we have no other complaints. It does occasionally stop sending hot water when James is shaving, but if he turns the water off and on and again, it'll be fine.
The tankless can most likely be installed in the same spot. Ours is also in the crawl space, and we have bathroom and laundry room on the second floor. You can get mini booster systems for near the sinks/tubs/showers, but not necessary.
Ours was installed prior to us moving in, so I'm not sure about price. I know when we looked into one at our old house, they were a few hundred dollars more, but nothing that wasn't ridiculous or anything.
Yes, you can hear them if they are near living space, but it's really not an issue. Ours is below our living room, but the TV is always on, or we're upstairs, so it doesn't bother us.
Let me know if you want to know anything else.
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