First, a disclaimer that I'm impressed by the level of functionality of DMM6500 in general, and I understand there's a lot of extra firmware complexity in supporting multiple channels like 2000-SCAN. I think it will be a popular model. However, there are still some bugs to iron out.
Specifically for 2000-SCAN:
*) When setting up channels, the displayed unit doesn't update until the channel is manually switched, making it quite confusing what is going on.
*) The graph scale is not updated when changing what channel is viewed (when changing from viewing 24 C temperature to a channel with 100 ohm resistance, the graph will show 24 ohm, when it should be 100 ohm). When Y-axis SmartScale is active, the axis is zoomed when the next reading appears but not sooner. For a slow scan sequence, the graph can have the wrong range settings for quite a while.
*) At this point, pressing the plus-like arrow button in the upper right to autoscale the graph does *not* correct the Y scaling until a new sample is taken. Besides, the autoscale is quite unhelpful as it prevents manually scrolling afterwards.
*) When looking at the graph of one channel that takes a burst of readings (count=10) every 10 seconds or so. Settings: X-axis=SmartScale, Y-axis=Autoscale. The Y-axis only adapts to the latest burst in some cases; some bursts go past without autoscaling.
I have also seen a bunch of other bugs, relating to sampling, graph grapics and especially the histogram view. I also lost a night of logging when the DMM froze when I attempted to view the graph in the morning.