I'm looking at the staking history at stakeunited.com and it doesnt show anything for experience points (XP) it shows a lot of history for almost every other coin though, it also shows zero hours/stake, 193 members, and 0.00 AT stakerewards. this makes me think that the XP pool staking isnt actually working or returning any rewards.
They just started staking last week. The returns look decent. It takes close to a week but works out to ~.7%/day. Of course, I'm sure this will fluctuate (hopefully up more than down) as the process matures.