Somewhere during SR2, I was very fed up with Shadowrun and played CP2020 for ten straight years. It's a great, flexible system. Very lethal, full of attitude, more cyberpunkish than SR (obviously), wonderfully pulpish/trashy and great for antihero action.
I esp. liked the "voice" of the game, the way it talked to the GM, offered help and ideas on every page and didn't care what was ingame and what was outofgame.
I always liked my Seattle sourcebook and the Street Sam catalogue -- in CP2020, you have similar books (Night City sourcebook and chromebooks), and they are like their SR counterparts on steroids.
However, what was good about CP was also bad: It was SO cyberpunk that you actually had to live in the 80ies/90ies to fully enjoy playing it. The more our real world moved on to "the age of Apple", the less fun CP2020 was (plus, we played the Stormfront campaign and blew Night City to shreds -- it was an epic finale of the campaign, but after it there wasn't left anything to say . Or to (story)tell).
I learned a great deal from CP2020, and when I run the shadoes now, there's a little nihilistic cyberpunk within me grinning maniacally

THE FUTURE IS DISPOSABLE.
ATTITUDE IS EVERYTHING.