I don't read manuals... or Japanese. But I did look at a lot of documentation while eagerly awaiting my C860 (which got lost by the courier for 6 six weeks!).
Flame Wars! Flame Wars!
Regarding the 6000: since i bought my c860 instead, i'm damn sure going to stand up for it. The screen on my machine is fantastic. I'm not sure about a drop safe pda..... sounds questionable, to be nice about it.
My C860 is 100% good english. I have Cacko since i got it, so this is sharps stuff, without japenese and loads of improvements. The 6000 has no other roms available for it apart from the original whereas the C860 has pdaxrom which is a full minilaptop linux distro.
Regarding the manual, i'm sure it's just stuff like charging and stuff so it's not going to help you setup your computer. But when you get it, charge it and switch it on. Better yet, get it from here like i did, and ask the person selling it to put Cacko on it for you, and you'll be in perfect english from the switch on - you also can ask if there are any dead pixels to make sure (with a new one you take a chance!)
besides, this is linux with all its documentation - and let's not forget the holy ZUG.
good luck with your choosing!