I really don't understand how this a major flaw that will prevent you from buying this watch. What is it with wanting to be synced with "GPS time" so badly ? Simply set the Time of day when you get your hands on the Ambit and you're good to go ! what is so wrong with being 15 sec off the official atomic clock of the world after a couple of months ?
Seriously, I don't want to be mean to anyone, I simply don't understand why is it such a big deal.
I even prefer that it's not forced-sync with GPS time. I sometimes set my watch 10 min. in advance on purpose so I can get up 10 min. earlier when I forget that it's set 10 min in advance. Yeah, I'm that kind of person...