Cheers, all!
They're pretty much an unknown quantity over here, but he's well established in Scandanavia. I've done a lot of research (thanks to Google translate!), and had a lot of discussion with Tommy (whose English is impeccable) and existing owners.
My Bergs are great - they're Bergs, after all - but I don't do tweeters any more. And, although they aren't heavy in the grand scheme of things, my back has been playing up recently so the lighter the better.