I went 100% decaf. I sleep better at night and no longer wake up groggy. It's amazing.
I always considered myself a "night owl" who didn't like mornings and preferred to stay up late. I often spent the first hour or two of the day waiting for my body to boot up fully and for the caffeine to kick in. Now I like mornings better, and I don't look forward to the sun going down.
Switching wasn't really a problem. I didn't experience headaches or any kind of physical abstinence effects.
There are downsides to eliminating caffeine. One is that one becomes very sensitive to it. Many coffee shops don't serve decaf, and if I happen to drink a double shot of espresso even as early as 2-3pm, I will find myself stupidly awake at 2am. (On the other hand, if I feel tired one morning, some caffeine can be miraculous.)
The other problem is that the pleasure of drinking my daily latte has been greatly diminished. I used to look forward to getting it, even thinking about it before going to bed. Now it's... fine. The taste is still great. But there's something that feels like it's missing. I still crave it, but my body no longer does.