I am declining the test. I don't think it's healthy and I suspect it leads to misdiagnoses. I took the 3 hour test ages ago when I wasn't pregnant but had borderline blood sugars, and it was horrible on all the pregnant women around me who weren't allowed to eat even though they were starving. One of them just ate anyway. Also the sugar water tasted terrible. These days I have excellent blood sugar from exercise, low stress and nutrition, and my midwife doesn't insist on the test.
Here is what we're doing instead: at week 28 I monitor my fasting blood sugar every morning and then postprandially (1-2 hours after starting breakfast). The tests are only there to make sure your body is not exposing the baby to high glucose levels. If you are at normal levels while eating normally, who really cares what happens when you drink sugar water? I never normally drink juice or sugar water with this pregnancy, so it doesn't make sense to me to have that be my test. I already know that when I eat a normal meal even with real dessert, my blood sugar still doesn't go outside of normal. To me, that's all that we need to know.
btw, the store brand home glucose monitors at target aren't really that expensive, so you can keep an eye on your bg anytime you want. I do it about every 10 days now.