I actually own one pair of NS-1000Ms, two pairs of NS-2000s, some B&W, Manger MSWs and Quad ESL-63s. There's a bit of an interesting story behind my 2000s; they are NOS with one pair still in the wrapping, but that's for another day. The woofers are actually 13" diagonally, not 15" and the mid and high drivers have a different visual texture than the NS-1000s, and the tweeter frame is larger on the 2000. For the Yamahas I would venture to say the weakness is the absence of time alignment (I'm not even sure if people notice this) and wide acoustic axis spacing due to motor structure size, but remedying this likely would have raised end buyer cost by a notable margin.
I found the Yamahas by accident in a showroom while in search for something much different and had no idea what they were. Needless to say after listening a few times I was impressed and I paid a bit on the higher end of the spectrum I suppose but from inquiries I've learned the prices varied. The bass is great and dynamic but its not as refined as the 63's bass. So far I haven't found another loudspeaker as clear or color free from the mids up as the NS-1000M apart from the NS-2000. While the driver placement doesn't allow as flat of a response with the 2000s', the highs are noticeably clearer.
I found the Yamahas by accident in a showroom while in search for something much different and had no idea what they were. Needless to say after listening a few times I was impressed and I paid a bit on the higher end of the spectrum I suppose but from inquiries I've learned the prices varied. The bass is great and dynamic but its not as refined as the 63's bass. So far I haven't found another loudspeaker as clear or color free from the mids up as the NS-1000M apart from the NS-2000. While the driver placement doesn't allow as flat of a response with the 2000s', the highs are noticeably clearer.