I am a member of a couple of these clubs. They were still underground. Officially you needed an introduction from a member. And you still had to be weary about the police especially when you left the premises. One club insisted you put your stash in your underwear. It's good that consumers don't need to be in fear of that - but for many it won't really make any difference because as you say, there are already members clubs. I expect this will drive up quality and hopefully bring down the price in places like Barcelona where it is currently quite expensive compared to other areas of Spain.