In reply to The Patriot:
We have two in the household (wife and son) who both use it for pool swimming, biking, turbo training, hiking and running.
Fantastic watch, and no issues. Their measurements of distance and trail on Garmin Connect / Strava are within a gnats whisker of mine, which is a trusty Garmin 910XT. I'm just saving up my beer tokens to replace that with a fenix 3.
They weren't interested in the notifications or activity tracking when upgrading from a Forerunner 220 but both have enjoyed seeing step and text notifications as they wear them as a daily watch too.
I plot routes using OS Maps then upload easily to the watch and the breadcrumb trail is brilliant to follow when out in the hills. You could do that for following ride routes / offroad running too.
Battery life is brilliant too.
A much cheaper option is the new Garmin Vivoactive, but there are many reasons why, if you can afford it, the F3 is a better option. E.g. 1 second gps recording (I don't like smart recording and think half the 'gps issues' are because of this), multiple sport options and battery life.
Never owned a Polar product so can't compare, but as said above DC Rainmaker is your man for comparisons.
Hope that helps!