I'll lead with a concise source on how to use it:
How to Increase DHEA Effects | LIVESTRONG.COM
I first figured out DHEA was worthwhile by combing through Jordan's forum looking for supplement recommendations. It seemed like DHEA popped up a few times with high regard. Then I saw that it was indeed banned by the WADA, so I figured I should look into it more.
From what I've learned over one complete cycle (on and off) is that it does seem to help with recovery and sleep. When "on" I feel less beat up. However, as a warning, when you cycle off, you might get a bit grumpy/moody in the first week, which dissipates. Goes away completely once the cycle repeats.
There are a few others around who've used it as well. I also supplement with BCAAs, chromium picolinate (specifically for the DHEA effects), ZMA (maybe this works? I dunno), and creatine.