I just got one this month on ebay to from a guy in sweden arrived here in the UK in 3 days.
Took it to China for 2 weeks and loved it the results are amazing with provia and velvia, was a little under on average exposure so might make it half a stop over next time.
Found the best way to use it was to aim, then flick the mirror up which is right nest to the shutter release, then fire, found i was able to hold it very steady that way. check out some of the results on www.collarge.com and then goto china.
My back did ache after 2 weeks lugging this around but i did have the canon as a backup as well, next time i would be happy with just the Pentax in my bag.