The 'Chorns were very wide -- They're nowhere near the "biggest most powerful" speakers...
For instance, my Tyler D1's, which aren't even the largest in the Decade line, are much taller, go considerably lower, freakishly higher, handle much more power, have a flatter response, etc., etc., etc. Although I think the Klipschorns are about 2 pounds heavier if you don't include the base blocks... The prices are close but there are better speakers (such as the Tylers) for that sort of $$$.
Anyway -- They're "classics" -- For their time, they were quite friggin' cool (they're still quite friggin' cool in a sort of nostalgic way). And they don't exactly sound like crap (although I wouldn't actually want to work on them, as they're not as accurate and consistent as many other speakers in that price range). They're "fun" - They're big-sounding, big-space, easy to listen to - and it's actually kind of cool that they're still in production (I didn't know that).