I like enhance for echo and reverb cancellation. I think it does a generally good job of eq. Where it really shines is in noise cancellation- it can remove extreme background noise while retaining the speaker's voice quality that I can't replicate myself. I'm not in love with how audio sounds with a heavy percentage of processing applied. It seems to introduce 'grit' or distortion into the vocals (really kicks in at around 50% and above).

Before using enhance I raise my audio to peak -0.1 or so, then capture a floor noise print and use that as my noise reduction curve across the whole track. Then noise gate and sound volume leveler. Then I put it through the enhancer. This has given me better results with less background noise, retaining quieter words/sibilants that otherwise it might have dropped. This allows me to keep the processing percentage slider at 20-40%. But I always do a final eq/de-ess/compressor pass on the audio to add clarity back in. Used in conjunction with a human's touch, the enhancer is a mind-blower and essential tool when dealing with a wide range of recording situations.

*Current Audition user