YES. It was brilliant, I loved it. I saw it a few weeks ago and really enjoyed it.
Yes, it's a musical, but it's a very ...gory musical. Some of the songs involve gory subjects (I won't say, as I'd consider it spoilers), there are bloody scenes and so on. When I told people about it, it sounded very strange to them ...and I suppose it does sound odd, but I really think it worked, the songs and singing is great, the characters are great, it was really well done.
Musicals are not my thing, but I did very much enjoy Sweeney Todd, and I'd recommend (which I have been doing!) seeing it.