I have an EV 18 in an old Musicman cab. Opened up the back, and that mofo has AMAZING, beautiful tone. Big open roar. I generally use it with my 68 Bassman, but my Traynors kill with it too. I love the sound of 15s but don't have anything recorded with it, but there are a lot of similarities with the 18.
Here is the Bassman, EV in action.
http://www.soundclick.com/util/getplayer.m3u?id=5664483&q=hi