What got me was that it doesn't just throw a generic workout sheet at you and leave. It asks about your situation first (goal, level, how many days you can actually train, what gear you've got, your routine) and builds from that. Then it tells you why the plan looks the way it does, which no other app had bothered to do for me.
Stuff I keep coming back to:
The AI Coach knows my current plan, so if I ask something like "can I swap this, my shoulder's been off" or "rack's taken, now what," the answer actually fits what I'm doing instead of being some generic tip. You can also set how it talks to you (motivational, direct, analytical, whatever you're into).
Every session I log (load, reps, how it felt) turns into a real read on where I'm at: volume, muscle map, PRs, load per exercise. And it explains the numbers back to me instead of dropping a graph and leaving me to figure it out.
The plans aren't locked either. You get phases, active and archived versions, and you can edit days and focus whenever you want. You can even build one yourself from scratch and let the AI tidy it up.
The XP and streak stuff sounded gimmicky to me at first, but it's honestly the reason I've kept showing up.
There's a web version too for when I'd rather look things over on a laptop. Feels way more like having a coach that remembers everything than just a place to log sets.