Any decent bike shop will work on any bike and not hold a grudge for you buying it somewhere else. One of my many bike shop owner friends told me a while back, "We sell bike because we couldn't really be a bike shop if we didn't. Complete bikes are the worst profit per square foot of floor space in the store."
I would say I've never had a problem getting my BD bike worked on, but I do my own wrenching. I've had it in several shops while meeting up for group rides, etc. and never gotten dirty looks or anything. Kenesis in Taiwan and PRC makes good frames and forks. I bought a model with low end components and my worst regret is the rims. The upgrade I've been happiest with is the brake pads. Mine had generic Tektros and the pads were too hard to stop well. I picked up a set of Nashbar cartridge pads and they work very well, except in the rain. Now I can get inserts from anybody.