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We can run 2 showers at the same time with it. No real complaints with it, except that when you're doing dishes and the water is being turned on and off, cold water gets in the pipe before it fires up. You end up getting little bursts of cold/cool water. It's just a minor inconvenience.
They look cool, take less space, and are much more efficient. The TK-2 is power vented, so you need special venting that is more expensive than your B vent, and can't be hooked in with any other appliances. Yes it needs power to operate, no power, no hot water.
I know there are other models out there that are good too. Don't get a cheap one, get a big one that can do the job.