I've got a Takagi here in Eugene, Oregon and LOVE IT!! I did alot of research before choosing the Takagi. I think the Bosch are solid units too, but my Takagi has 175,000 BTUs, which I'm not sure the Bosch could get to, and it's got the direct venting - powered vent to the outside and fresh air supply from the outside. The unit's in the attic above the bedroom and I don't hear more than a soft woosh when it fires up. I've got a control panel mounted on the wall so I can adjust the temperature to whatever I want. It is true that the efficiency and throughput will be somewhat effected by the temperature of the incoming water, but that hasn't been an issue for us and we're on a well. We have run the shower and dish washer at the same time with no problem.
The takagi web site is below. It suffers from the typical grammatical problems of translation between asian corporation and english language web site but it may provide some useful information.

The only other issue to address, is whether you have hard water or not. Hard water will almost certainly shorten the life with scaling in the heating chamber.

I'd recommend tankless to anybody.

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