R# left a bad taste in my mouth. It quintupled start-up time for my solution (which has dozens of projects, to be fair), and destabilized VS. VS and R# ways of doing things would often conflict, and IntelliSense would frequently break. Input latency was abysmal.

VS has now mostly caught up with their feature set, and the only thing I miss is namespace refactoring (which I could implement myself with Roslyn.)

Is R# just an exception, perf-wise, to their track record?