I find this video very interesting. Specifically his rating of the Standard versus custom shop. I have a standard 50 that I absolutely love. It plays and feels fantastic. Yet I still yearn for an R9. And sometime early next year I hope to find a great one. But according to this video my gains will be "maybe" 5 to 10%. I'm not considering the R9 to replace my standard 50 or because I think it will be 2 or 3 times better. It will definitely just be a guilty pleasure.