Need these two to do two voice spots for you from their separate studios? They can do that. And their political dialogue voiceovers work--like victories in 2008 for Christine Gregoire and Mary Jo Kilroy. And previous wins for Senator Maria Cantwell and Governors Tim Kaine in Virginia and Joe Manchin in West Virginia.
And though they work together nicely, Mike and Susan are not attached at the hip - for which they're both eternally grateful. So, if you love one, but not both, neither will be offended. After a few decades of doing this, they get it.