In Canada we only have the orange one, (at least that's what I was told) but it isn't all that bad, it tastes like a sweet orange pop. I wouls have prefered a cola one though.
The 1st glucose test isn't too bad, but if you fail that you have to go for a more extensive one, in Canada it's a 2 hour test and in the States I think they do a 3 hour test. You have to fast for 12 hours before that one and they test your blood before the drink then at 1 hour and 2 hours after the test, it wasn't so bad except my butt was sore from sitting in those uncomfortable office chairs for so long...and they had to do all 3 needles in the same arm, I apparently have better veins on that side. Luckily I passed the second one...but it is all worth it in the end. Goodluck!