I've only seen two episodes, but I think it's one of the best re-imaginings of a classic character I've ever seen.
Yeah, the modernization has been brilliantly done. It's very very rare for a TV show to use things like cell phones in a way that doesn't look cheesy and stupid, but they pull it off so well. And I don't know if you saw last night's, but the way they re-wrote the ending to Reichenbach Falls is just plain balls-out amazing.