As this group of trend setters has evolved from their high school woes to the present post-college life lessons, I've seen it all. Not necessarily what most would consider a kid's show, it's definitely geared more towards the later teens, and young adults who evolved with them.
In the beginning it was a simple story of small town twins trying to make it in the busy mess of a Beverly Hills high school. As time went on they all became an intertwining group of friends who encountered everything from bed-hopping and drug-swapping to business owning and usual groaning. Through college, and now entering "adult-hood" with extending families and more serious story lines... the original pair (the twins) are no longer in the show, and others have floated in and out.
Through all of this, the basis of glamour mixed with morally stretching behavior has remained true. Not your general fell-good family television moment, in fact I wouldn't recommend it to younger children: it is definitely at the soap-opera end of the spectrum.
Even though the show has been on for so long, I still enjoy watching it and following the stories the come up. They've dealt with rape, abuse, drugs, friendships, divorce, betrayal, and more... and now they even' begun to deal with a young family, having a baby, and parents who don't approve (because of racism). It may be easier for a long-time watcher to enjoy and follow, then someone new trying to step in... but I couldn't be too sure, since I've watched since the very beginning.