i have used a condensor light source since the early 1980s. it is in a durst m301. when i went to large format i bought a d3v and used that with condensors for the better part of 15 years. a few years ago bought an aristo cold light for it. i had always heard raves about how wonderful cold light is, and remembered when in college i used one for a little bit it worked pretty well. and thinking back, when i printed for a local portrait photographer, she had a diffusion enlarger so i jumped in head-first. to be honest - never really got used to printing with a cold light. the "smack you in the face" sharpness and contrast just wasn't there ( like what dnmilikan said ) so i put the condensors back into the enlarger.
call me crazy, but last year i bought an omega e4, and replaced the ailing omegalite with an aristo cold light source thinking that i would modernize it so i could use vc papers, and try it again. i found a set of 10" condensors "just in case ".
i too am undecided about what the raves are all about ...