Classic, high quality Eau de Cologne. Groundbreaking only because it was one of the first, and simple enough to believe Guerlain hasn't messed with it too much. EdC's like this one aren't for any one thing, they're incredibly versatile. It's the perfect office fragrance because it stays very close to the skin with minimal sillage, but is natural enough not to offend the extra-sensitive.
Imperiale by Guerlain is a scent that my son decided he liked after not wearing any fragrance for years because they were "too much." I bought him a bottle for Father's Day and he wanted another for his birthday. He likes the fact that it fades quickly and leaves a subtle scent thereafter. This fragrance has been around for over a hundred years, so it must have something special. I was pleased with the ease of ordering and it arrived on time.