Just got my first, a Series 4 44mm in black SS with black milanese loop. I've had it just over a month.
Cellular is standard on the SS, but I've not activated it. +$10/month with AT&T. Only missed having that on one occasion so far.
Good size, easy for my aging eyes to read
Really helpful in keeping with my desire to improve my fitness, fun to try and close the rings for the day.
Wear it 15 hours a day, still has ~55% battery at end of the day