I am very fond of your graphical symbol announcing the "health" of each file:
Being able to see immediately that "all is green" has a lot of value, but there is one issue that causes grief. The warning "Redundant cast" shows up whenever I use the "this" operator, trying to get Intellisense to kick in. So, an innocent attempt to save typing (and recall what the heck was the name there), results with
Solution? R# could perhaps support the feature, where one can get the list of class attributes and methods without typing the whole word .this (say just "."), and have that "." removed when the symbol is selected. If the wrong symbol is selected in a hurry, one could just place a "." in front of that symbol, and enable another pick that would replace the current (incorrect) one.