The only time I used it was when I played some metal covers back in the day but even then it wasn't the crazy fast stuff. I was never that good at it so it hasn't changed my approach in that it wasn't really a huge part of my approach to begin with. If I end up improving my double bass skill it will be purely for my own satisfaction and maybe to do some recording of metal ideas I have.
As was stated in the previous post, there are way more uses for double bass drumming than for just "metal".
As was stated in the previous post, there are way more uses for double bass drumming than for just "metal".