That depends on whom you ask: I'm pretty sure your financial planner will advise against it, but your triathlon coach will likely give a resounding endorsement. A power meter is an investment in yourself. While other big-ticket items such as high-end bike frames and aero wheels will produce marginally faster splits, they do nothing to improve the cyclist turning the pedals. Conversely, adding a power meter will serve as a tool to make you a stronger, more efficient and a more educated rider. Prior to power meters, heart rate monitors were the best tool available to prescribe, monitor and track intensity in training and racing. While heart rate monitors do offer a quantification of effort level, the results can be…