For me, the main three have been:
#1. Greater selflessness. More attention to her emotional and sexual needs, plus a strong eagerness to meet them at nearly any cost.
#2. Acceptance. For instance, feeling like something is missing when I am unlocked. Over time, I noticed the device less as it became my default state and I grew more comfortable with it; now I only notice it when it's *not* on (like during a shower). It’s similar to wearing a hat all day, taking it off, but still feeling like you're wearing one at times. I have long accepted this is my new normal. Also, my view of orgasms has shifted. I’ve come to accept that they were never truly mine alone; in fact, they belong to her, and I don’t need them to feel satisfied or useful. Or as she puts it, "Your cum always belongs in your balls."
#3. Radical shifts in my sexual cravings. When I look at my KH now, I don't think about putting my dick inside her. Instead, I fantasize about licking her, using toys on her, loving her with a strapon, or taking the strapon myself (if I'm lucky). My lustful thoughts regarding women other than my KH have decreased significantly, which brings incredible peace of mind. My entire concept of what sex *ought* to be has improved for the better. Sex is no longer just a phallus-centric sprint toward my finish line, but rather a marathon of exploring and loving her body in alignment with #1.