In my humble opinion, using WCS is very good if you get all the stuffs done. I'm talking about the heatmaps.
One of the major factors of locating a Rogue AP or Client depends on how many APs get to see it/them and the layout of a location, say an office floor.
When I tracked down the rogue APs/Clients (several times), I just used the output from the WLC list. I looked at the signal strength indicator and easily triangulated the located of the targets with an accuracy of about 2 meters. Let's say that the a number of people were very amazed (including the targets). It doesn't take a nuclear physicist or a rocket scientist to nail down the target. It's gets alot trickier if the target starts moving since the WLC refreshes every 30 seconds.
At this site there are only some older 1220 and 1230 APs. WLC is not an option. I was looking more so for an actual device of accurate software that I can load on my laptop. I have netstumbler but maybe I am using it incorrectly. I can only get to about 40-50 feet in accuracy and then this is a multi-story unit so I am never sure if the signal is actually on the floor I am on or coming from above or below..