No hangover -- sleep is improved.
If you have used G, it is a weaker, longer acting version, so you do not wake up in the middle of the night from a dopamine rush -- you do get a bit of that energizing dopamine rebound, but it is after about 8 hours instead of four, and it is more subtle.
I have someone gathering feedback from the boards, like our site has for ONE and LipoDerm -- it should be up in a couple of days.