I like the 5170 in particular the P diamond dial and the G pulsometer dial but they are far more dressy. I find this one more sporty and thus better for my lifestyle and typical attire.
and definitely very comfortable, will fit under any shirt cuff. It will be interesting to see if they make this model in other case materials and dial colors. I think a rose gold black dial version would look great, perhaps even with silver subdials?
Wearing the 5172G today. It's a fantastic watch. Very legible and clean dial with terrific lume. The lugs are a thing of beauty and the watch wears well on my 6.75" wrist. I love the factory strap but have ordered something to change it up a bit. Will post pictures on a different strap when it arriv