I've built up the BR-1 kit, and it's a pretty rewarding experience.
You do have to be good at soldering, preferably use a soldering gun on this, as you'll need lots of power to do the large solder joints. As far as their solder reccomendations, I went for regular old Kester "44" rosin core...I really don't believe in silver solder for electronics...after all the receiver isn't useing silver, is it?
Until I say the price of some Magnepan MMGs, I was strongly considering the Dayton Euro kit as well. good stuff. Only thing I could ask of them is to make a center channel version of the BR-1, so I could have a killer home theater setup.