Detailed Review: If you have 10 minutes to spare and want to know quite a bit more then this link is for a DETAILED review of the Garmin 920XT.
This is a feature-rich, triathlon sports watch and activity tracker that will cover 98% of the features you want (but perhaps don’t need) for training and racing.
Positives: if it’s functions and features you’re after; the 920XT is more likely to have them than the competition. It is highly feature-rich and is used by many Age Group-level triathletes. The Garmin ‘data ecosystem’ is open, allowing you to get its data elsewhere on the whole. A wide range of ANT+ sensors exist and support for STRYD/MOXY/BSX is now relatively good.
Negatives: aesthetics are questionable; GPS/current pace are suspect at times – although improved in late-2015 with footpod support; numerous reports of ‘losing’ connections with sensors – which is a fundamental issue – plagued earlier iterations. Later iterations have seen the device slow down with the installation of CIQ apps. Some may argue that more features mean more stuff to go wrong and, to a degree, that has been the case although (Jan 2017) this is now largely resolved.
Comments: It still requires work on the swim functionality although that has been improved to include workout support. There were notable firmware updates in 2015 and 2016. Later in 2016, a further-upgraded version is possible to introduce optical HR. It still lacks ‘repeat’ functionality for training bricks and Otillo.