I tried GtkRadiant for Soldier of Fortune II recently...It took a while to get used to..
My personal likes:
+Brush creation is automatic; no need to press ENTER like in VHE
+Is somewhat similar to VHE like the clip tool with the clipper
My personal dislikes:
-Brush deselection: you have to press ESC to deselect, unlike VHE where you can just click on another brush to start working on that
-Carve works the same way as VHE: messy, ugly, bound to get a leak, etc.
Well...
[/gtkradiant] [hammer]