I use it every chance I get, not because of convenience but because of security. Any opportunity to avoid putting my card number out there is a good thing to me. Other than one hiccup early on, it has worked quickly and flawlessly every time.
Also, I really like that every use of my card (whether through Apple Pay or by conventional means) appears as a notification on my iPhone instantly. It shocks me how instant this is. I've handed my card to a waitress and it seems like mere seconds after she walks off, I get the pay notification. It's nice to have these pop-ups because it's much easier to verify a transaction when it happens rather than scour my bill at the end of each month.