I like it...though I'm not so sure how insightful "real-time" comparisons are (It was XY at this time yesterday).
Usually you'd want to compare data from a set date range (eg. Monday 12:00AM - 11.59PM compared to Tuesday 12:00AM -11:59PM). These numbers would be much more accurate/comparable (you could still have a graph showing the activity during 24 hours)
As keii4ii already mentioned, I think the statistic tool could be more powerful if you'd be able to switch the comparison dates per day/week/month. Kinda like google analytics.