I can't remember the model number--I will look when I get home--but I spent around $200. It was a mutual anniversary gift for my wife and me. The parts that need replacing are a small brush that draws dust bunnies in, a filter, and the battery. These are all proprietary (read: expensive) but I am sure that most of it could be replaced cheaply with some creative tinkering. It is the battery that really kills you, but I think people have so much trouble because they don't follow proper battery maintenance--keep it charged. The devices themselves may draw down the battery too much, but I am not sure.
I am not sure why people are saying a 2-4 year lifespan. The design seems solid enough and I haven't had any problems in the year that I have had it.
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