I use it for all my maps. Its a great piece of software given its price, if you ask me. It has a few quirks, but nothing that is a fatal flaw.
It can make excellent, publish-quality maps. Not as quick as say, hex mapper utilities, but it can produce much nicer maps, if you ask me. It also has excellent layering ability, so you can make a map, with many overlays that you may not want to print out for the players, for example.
http://campain.3eprofiler.com/map.shtml (my current campain map)
My only complaint is I wish it had more vector based placeable map items (which scale flawlessly). I'm definitely no artist, so I have no hope of making any myself. Using bitmap based placements makes the map only have limited zoom abilities, as the bitmaps either become aliased on zooming out, or pixelated on zoom in.
For $35 (?), I wouldn't think twice about buying it. The cool vrml tool seems neat too, but I haven't had time to play with it.
-Mike