Yes please, I work for a big bank and we use VS for C# and F# and Rstudio and Notepad++ and RGui for R. Having one-ide-to-rule-them-all + supported by Microsoft would be a godsend for us.
Yes we've tried it, it's not as stable as plain vanilla R and it's not as powerful in terms of dev tools support (mostly productivity wise, might just be because we are used to them) as RStudio, Eclipse+StatET, Notepad++ w/custom language items.