The Ultra is heavier and it carries a lot of its weight in the glass, which is kinda high off the wrist. So IMO, the watch feels a little heavy, but the bigger issue is how the weight is somewhat off the wrist.Any update on this? I'm contemplating upgrading my Series 4 as well and am considering the Ultra vs standard 45mm watch. How has the adjustment period gone?
To counter this, I have found that using a band that allows for micro adjustments, so that the watch is held snugly, but not too tight (i.e. Trail Loop). Another option is the Ocean band. It doesn't have micro adjustments, but does stretch slightly, so again it can be adjusted to be snug but not overly tight.
I didn't mention the Alpine Loop, but its a nice band that works in some instances as well.
In the end, most folks are fine with the Ultra once they find a band they like. Some folks do find that it's too heavy. You just have to try it to find out. I suggest buying from somewhere that allows a return if you decide it's not for you.