I'll probably never let my VS-700 system go, until it breaks and can't be repaired. This controller just looks way too good. And it does what other controllers can't do if you're using Sonar. I think this system remains the greatest system ever created for less then $50,000.
Unless Tascam comes out with a competitive system that makes me want to sell the VS-700, the only thing I might consider upgrading is the audio interface to something better, that's about it.