You do still have to click through to get to the bottom of a menu. There is a home selection on the menus which I don't remember from before.
The warnings are approximately 60 seconds apart. Normally when I am changing the cartridge, I will get a "not primed" warning between the time I rewind and the time the pump wants the new cartridge. If I am prepared and have the new cartridge ready, I don't get any extra alarms.
The belt clip is metal. My son never uses it though. He just throws it in his pocket. I could have swore I saw some ABS holsters somewhere...I can do some digging for you if you want.
I have the "home" selection on my 2020, but it's at the bottom of the menu. Really stupid that you can't scroll up to get to the bottom.
I generally run my cartridges down to 0 in order to waste as little insulin as possible, so it usually winds up that I sit down to change it after the first empty cartridge alarm has gone off. It seems to me like they should disable the alarms altogether if you're actively pressing buttons in any of the prime/rewind screens.
I like the belt clip so I can clip it to my shirt on occasions when I have to drop my pants. The plastic case is a bit bulky.
Oh - are the cartridges still the same size? 2020 is ~200u I think.