so hang on to your old router as a backup, keep it on the shelf. personally i just did not want to manage 3 seperate devices. internally you are correct, there will not be enough added latency to make it noticeable. nor is having 3 tiny devices going to amount to a hill of beans on your electric bill. truly the ONLY real issue is why would you run 3 devices when 1 device does everything you want anyway. also, managemant of them is slightly more complex, but again not enough to make it a worthy dealbreaker.