In my case, I never parted from my dumb phone, however, I use my Pro¹-X every day. It's my ultra-portable laptop in which I do all sorts of stuff. I believe I open that keyboard a few dozens of times per day on weekdays and a few on weekends.
Given claude001's answer, I think I'm lucky that the keyboard still works perfectly. When I reach 1 year, I will certainly write my 1 year review of my experience with my Pro¹-X.
My dumb phone is mostly used for calls and SMS. Pro¹-X's call sound quality is fine but for me, my dumb phone is more reliable to not run out of battery when I most wan