You want to follow a structured training plan, improve pacing on climbs or long events, or accurately track fitness gains over time.
You primarily commute or ride for pure leisure and have no interest in analyzing watts or performance metrics after a ride. Key Benefits of a Power Meter
You are a beginner still learning basic bike handling, or if you don't yet use a heart rate monitor (HRM), which is a much more affordable first step into data tracking.
Deciding whether to buy a power meter depends on your specific cycling goals, your interest in data-driven training, and your budget. For many, it is considered the single most effective tool for increasing speed and tracking fitness.