Only 2 days with fenix 5 and I like to look of the watch, but already the Stryd Power meter ConnectIQ data drops out often making that data useless for me and we are seeing Betas flying out to fix things already. I had the 735 for almost a year and it worked from Day 1 and has had 1 update and no Betas and I never had an issue with Stryd.
Have not fully tested GPS against 735 for running yet, but if it is as others are showing (less accurate tracks and possibly under accruing distance) I am definitely out quick here.
Forgot what the fenix 3 experience was like after so long, but now I am reminded quickly. Garmin just needs to move this entire line of wearables under the team responsible for running watches.