Glacier Bays Blue is from OPI's Canada collection. I bought it on accident, because I thought it was OPI Russian Navy. I still get them mixed up sometimes in the bottle, but outside of the bottle the difference is very obvious.
GBB is a duochrome that easily flashes teal, blue, and purple. When it's on my nails, I'm constantly admiring them, and I get compliments all the time. The color flashes even inside, and outside it's enough to make you crash your car on a sunny day looking at your manicure.
The application gives me some problems, visible polish lines are a huge issue. 3 coats are necessary to reach opacity and if you aren't careful around the edges you will not be satisfied with your mani. Not for an inexperienced manicurist for sure.
Overall: Gorgeous color, some application problems, would buy again.