Should I buy a power meter? It's one of those questions that has been discussed amongst friends, within clubs and across internet forums for decades. The experts will tell you that you'll see bigger gains if you train by power. All the pros use power meters, at least in training if not also in races. You can more easily regulate your efforts with the use of power data, to ensure that you don't blow up before the top of that long climb or before the final run in of your race. Of course all of this just explains the usefulness of power meters but doesn't answer the question of 'should I buy one?' as that question surely boils down to