The ease of constructing maps was and is Intermapper's best feature. I've been using Intermapper since the original Dartware release, and this has always been the reason I've stuck with it.
The new release I just upgraded retains a high degree of compatibility with older versions, but adds important new capabilities like probe groups the original didn't have.
First, I'm content with the functionality Intermapper provides in regards to defining networks, arranging maps, and so on. I haven't gotten deep enough into defining custom probes or creating elaborate charts to comment on that yet.
That said, it would be cool if the map arrangement facilities were extended to provide some automatic alignment facilities in the style of Omnigraffle or Visio.
There are a couple of glitches I'd like to see addressed. One is that sometimes the Insert menu is grayed out when it should not be. (Yes, I know about the read/write toggle and no, that's not it.)
Another, more serious issue is that sometimes editing probe settings either crashes my VNC sessions or the whole Mac OS X server (in the kernel_task). Now, I realize that this is not Intermapper's fault - there's no way an application should be able to crash the windowing system - but realistically, Apple is unlikely to fix this so it would sure be helpful if Intermapper could avoid doing whatever causes this.
I use it for basic network management, capacity planning, and server availability checks.