It was an epoch making fragrance. It was part of a revival of unisex perfumery which radically transformed how perfume is worn right now. It was also part of the culture of social guilt which was the hallmark of the 1990s and is therefore, spare, so clean it squeaks, and presented in an almost apologetic bottle which seems to say “perfume is evil, consumerism is evil, but hey, you gotta smell good for work somehow huh?”. It’s also incredibly strong and people don’t realise how strong it is because they think freshness = lightness.
I like how it smells (it’s basically a riff on an Eau de cologne theme, with some hints of aromatic Fougere in there too) sparkly clean lemon, a little woodiness, some green notes and a big dose of the aquatic synthetic Calone which defines a whole raft of fragrances from that era (Issey Miyake immediately springs to mind) all good. But Calone has a proble, the more you smell it the more sensitive your nose becomes to it meaning that eventually it overwhelms everything. Now CK 1 isn’t guilty of having as much Calone as some of its congeners did but it’s enough to put me off.
Smells lovely on other people though and I’ve often asked someone what they were wearing to be told it’s this.
If you like this sort of fragrance there are a lot of alternatives.