Thanks for the detailed reply. For now the Brazen will have to do, but I need a new brewer for my cottage as well and the Bonavita just might be the ticket.The Technivorm has the visual advantage with the brushed metal body compared to the metal veneer on the body of the Bonavita. The body will never ever break on either model if used but not abused. The weak link for both is the clear plastic reservoir. This material is reasonably tough and can handle pressure from water forever but would be the most likely part to suffer damage in an accidental fall from the counter. Neither has a clear advantage in this weakest area. The rest of the body is a tie between the brewers for durability.
What might be considered an advantage with the Technivorm is the copper heating coil. The Bonavita heating coil is steel or aluminum - I am not sure - it might even be an aluminum with a steel inner lining like the heating coil in the Capresso MT-500 brewer. Both heat the water quickly and both separate the heated water from the cool water in the reservoir so the results up to the shower head are similar with regard to time and temperature.
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I like the shower head better on the Bonavita but the ability (a necessity really to make an excellent pot) to tweak the flow and stir the grounds in the Technivorm is nice. Both of my brewers have glass carafes that look and pour similarly. I doubt you would make a mistake with either brewer. Looks and counter space will matter more than any technical advantage I can see.