I want to put a proposal to my company to buy multiple developer licences for RS4. The problem I have is that I can wax lyrical about what RS4 has done to make my life easier. Unfortunately that does not necessarily translate into the question they'd likely ask, namely "what does it do that you can't already do in VS .Net?" Is there a link or a document I could read or pass on showing the unique features that RS4 does that VS.Net does not or cannot do? Something that will sell the advantages of RS4? I could show them refactorings and what have you but they'll want to know more about the cost of ownership and the value RS4 brings to the party. Any help or advice appreciated.