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The {{Polar M400}} is a disappointing watch, with poor GPS accuracy and limited support for [[Cadence]]. Even at its low price point it I don't think it offers good value for money. If you're after a midrange GPS watch, I'd suggest looking at the [[Garmin 610]]. While it's an older watch, it offers far more features than the M400. The Garmin 220 is more expensive, but offers better functionality. For a simple evaluation of a GPS watch, I look at how well it can answer some basic questions:* '''How far did I run?''' This is the most basic question, and the M400 has stunningly bad GPS accuracy. I've had the M400 be out by a mile on an 18 mile run, which could really screw up your marathon training. * '''How fast am I running?''' Knowing how fast you're running can be a nice to know, or it can be vital for your training or race performance. Because of the nature of GPS, watches that rely on GPS signal alone tend to have serious problems with current pace. Without the ability to display current [[Pace from a Footpod]] while getting all other data from GPS, combined with such poor GPS accuracy, the M400 can't answer this question. * '''Where am I? '''The M400 has no navigation features. * '''What's my cadence? '''[[Cadence]]''' '''is one of the most critical and often overlooked aspects of running. If you get your Cadence right, many other things naturally fall into place. The M400 has limited support for a [[Footpod]], no support for Cadence from the internal accelerometer, and no Cadence alerts. It's better than nothing, but it's not great.The M400 is not a good choice for ultrarunners, as its battery life is too short. See [[Shoes#Watches for Ultrarunning| Watches for Ultrarunning]] for more details.