I've already used the 910xt and the 605 for Olympic Triathlon and Marathon.
The 735xt is a great evolution. Battery life with normal usage (50 km of travel) lasts a week.
The satellite signal is taken in a few seconds
Cardiac sensor at the wrist quite accurate (after a few minutes the precision is superimposed to that of the beam)
You can wear it everyday (just a little nerd)
The heartbeat sensor on the wrist does not work with swimming (but is common fault to all high sensors 3)
It does not have the altimeter so it is not the maximum for the bike
Sometimes hard in the bluetooth connection of the cellphone
Incredibly happy after two months. Enjoyed some "half sports watches" before the Pebble watch and Sony SW3. This is the considerably more expensive but a lot better at training geek stuff and may additionally it except I exercise most used before such as:
1. To answer or reject calls,
2. Receive e-mail and text messages and some notifications from apps.
3. Find your phone.
Having just cycled three times but it worked brilliantly. But the functions of running and swimming, I have used a lot and they are outstanding. GPS will find very quickly and seem right and good in the swimming pool has just clicked if I had to stay in the middle of a length. If you want to correct simlängderna in retrospect it works, unfortunately not in the Garmin systems but can be fixed with the help of "swimmingwatchtools.com". Want pulse at swimming requires a chest strap type garmin tri. Costing type a grand but also measures your löpdynamik, which is pretty fun.
The battery has been enough for use around the clock over a week with bluetooth o'clock in the daytime and about 4-5 hours with GPS.
It is very comfortable and easy, so I sleep with it, and thus have both wake and sleep functions. Step count and pulse around the clock do I not so often, but it seems to work as expected.
Tried in business even heavier watches Garmin Phoenix, Suunto Ambit 3 and Polar V800 but fell for this much neater clock.