I bought the 1000's used, and sold them the next day. They were hard to 'fit' for my ears, and had a piercing sound that bordered on painful for me. I found nothing redeeming about them (yes i tried lots of tips and sources/amps).
I have both the Nami and the Kaede, and they both have a tuning/sonic signature that is very clean and detailed, more to the analytic side than I generally like, but they are special. I think there is something to be said for the claims about eliminating the 7 kHz resonance than many iems have -- perhaps that's why I love these, and could not stand the 1000's.
I know that the Kuru are not exactly like the Nami or the Kaede, but they are in the same family, so I think my comments may translate to them. The designer of the Ocharaku iems is a former Sony designer, so perhaps he did the 1000's as well.... Based on their popularity I have an occasional urge to try them again, to see what happens....
Hope some of this rambling helps...