9000 miles on mine now covering everything from boring 75 mile commutes to trackdays and everything between.
Rain and Slick modes are extremes and are easy to tell apart (one makes the bike feel castrated and frustrating,the other...well

).
Sport and Race however - it's weird.
Sport seems to bolster the low revs (tickover - 4500rpm) then it goes flat and makes a ZX10 feel well endowed with midrange (not quite but you get the idea) then takes off at the top end.
Race gives much quicker throttle response and can make maintaining a steady speed a little awkward - want to sit at 75mph with the traffic?Tough!You'll have to do between 71 and 79 and hope it averages out!
In Race mode the motor seems to rev out better from 5000rpm upwards compared to Sport.
No definite figures here but Sport Mode seems more economical too - in Race,I do my commute then fill up everyday - takes between £12 and £13 quids worth to top up.
In Sport however,exactly the same journey (to within 0.5 mile) and £10 fills the tank.
Not something I worry about (my last bike was a Duc 1198S - refils every 75 miles!!!) but worth noting if fuel economy is important.
Something else I've noticed which isn't exactly scientific but the engines 'sounds' a lot smoother in Sport Mode too - In Race it sounds harsh
So,I reckon I can tell the difference without looking