I play in a Top 40 band and my main rig consists of a 2009 Shiva EL34 head. With all I've read about the 20th Anniv. Shiva, I've contemplated jumping to the 20th. However, I'm not sure what I'd be gaining other than the additional gain flexibility. My current Shiva has the updated FX loop, adjustable boost, and the bright and shift switches. When I need "more", I'll engage my BB Preamp (coupled with the OD) or Suhr Riot. So would I have most of the options covered with my current rig that the 20th anniv. would offer? Am I missing something?