I bought a CM771 in November of 2000 and have been pretty happy with it. The monitor itself is beautiful, a nice flat screen and great picture quality. The only downside is that after about a month it began to give off this horrible high frequency sound. If i changed resolutions it only changed the pitch of the sound. weird. I called Hitachi and they promptly send me a RMA, so i shipped it to their repair place in Mass and they fixed it and sent it back in exactly one week.
That was all in January since then i havent heard anymore sounds and everything is peachy again.
I assume this was an isolated incident, so i would still highly recommend the monitor.
matthew