I've got a Mitsubishi Doamond Pro 740SB, which I use with my late 2001 iBook and PC. Bought it last July or so, so guess it's been around for a while now.
I've never used the SB mode, and don't think it's worth the extra. The Mac video output is brighter than a PC's anyway, from what I've understood. (I'm not a graphics geek, but there was a thread about this a month or so ago.)