Yeah he's a pretty awesome singer. Brent Smith of Shinedown is a awesome singer but I don't really like http://www.youtube.com/watch?v=xA3Wj-Zv6VQ
Apocalyptica needs to get M.Shadows or Shaun Morgan in one (or more) of their songs

Honestly, I think they're pretty gimmicky. "Classical" covers of rock and pop tunes are bad enough as it is, and they're not even a regular string quartet, so their pitch and timbre range is pretty limited.

Personally, I find these guys to pull off the amplified cellos doing metal riffs vibe in a much more creative manner: http://www.youtube.com/watch?v=gyLw6ZZodLQ

I frickin' love this band! Listen out for a song called I don't Care...it's them with the lead singer from Three Days Grace, Adam Gontier...it's a stunning one, and one of my favourite songs to drum to