I have been wondering about upgrading my 44 mm S4 for a while, and hesitated quite a bit to order this Ultra, not because of the price or the design, but because of its size. My wrist is around 180 mm and I'm worried it will look too big on it.
I'm not a professional athlete by any mean, but I do several activities where the watch can potentially take a hit: bouldering, football (soccer), downhill skiing, on top of the good old regular gym. So I could see a more tanky watch being useful. Also curious to see if the action button will allow me to record stuff such as my goals scored, climbing courses completed (for bouldering), etc.
After 24 hours of reflexion I finally pulled the plug and ordered it with the white ocean band, delivery expected for the 23rd of Sept. I figured that if I find it too big for me, I'll just return it.
Also, not a fan of the offered bands, but it's not really an issue thanks to the retro compatibility and the millions of options available from third parties.