I traded in my 46mm Watch 4 Classic for the new 47mm Watch 6 Classic and at first I was a little worried that the watch was too large on my wrist, but after wearing it for a few days I think I'll get use to it. I definitely noticed how crisp the display is compared to my Watch 4 Classic, and how much larger it is. The bigger display does really help me see the content much better with my old eyes. I like the thinner bezel, and so far the battery life is much better than my 2 year old Watch 4 Classic. I've activated Developer Mode on the watch and set the animation scales to 0.5x which seems to make it feel snappier.
I probably wouldn't have upgraded the Watch 6 as my Watch 4 was working just fine, but Samsung's pre-order trade-in offer was just too good to pass up. With the $200 trade-in for my Watch 4 Classic and an extra $50 promo discount, my cost was $197 for the 47mm Watch 6 Classic.