The only deficiency I find is accuracy when you are trying to workout at a specific pace on track.
On a longer run they are probably accurate to within 1% which makes practically no difference but you often find on a track that the inaccuracy multiplies on each lap so if you are doing say 1 mile repeats (4 laps) then by the end of the mile you can be 20 metres out.
It's not a biggie because visually you can see if your watch says 0.23, 0.46 etc as you go past the 402m mark you know that you need to up your pace because it's short but having a more precise distance and therefore pace would save a few brain cells when you're trying to concentrate on hitting your paces.
On a longer run they are probably accurate to within 1% which makes practically no difference but you often find on a track that the inaccuracy multiplies on each lap so if you are doing say 1 mile repeats (4 laps) then by the end of the mile you can be 20 metres out.
It's not a biggie because visually you can see if your watch says 0.23, 0.46 etc as you go past the 402m mark you know that you need to up your pace because it's short but having a more precise distance and therefore pace would save a few brain cells when you're trying to concentrate on hitting your paces.