It is snappier than VS+R# (and I can't bear to give up all the R# features), it supports emacs key bindings, it has (IMO anyway) much better support for ancillary stuff like directly issuing DB calls or interacting with source control, and I'm just used to the IntelliJ platform after using it for years.
Ironically I was listening to an interview about working at riot (the one with darmar). It did sound like there were no major flaws, which is pretty impossible ain't it. Reading the discussion proved the point I guess.
