Yeah sadly there are various twist mount styles: Garmin, bryton, lezyne, cateye, wahoo, giant, mio
"
twist mount", I like how they are called

Yup, my Garmin Edge 830 twist mount (installed on my new bicycle) is completely different to the old Sigma BC 800 (installed on my old bicycle), which is different from the Sigma BC 5.16 (made in 2016), which is different from every modern Sigma wireless devices.
Too bad for me because you need many twist mount kits.
I'd like to replace my old BC 800 because it's dead, and I specifically want the Pure1 because it's incredibly legible, containing nothing that does not belong.
Looks like the lower end sigma stuff is the same (BC, ATS, STS, Pure), the higher end has the symmetric style mount found here (Pure GPS, some of the Rox).
Yup, but the
Sigma Pure1 is available in two configurations: wired and the wireless (called ATS).
It seems a twist mount for Sigma wireless devices is less *deep?*, but I have to verify it

I assume you are not interested in something as complex as the Magene or Xoss, due to lower battery life.
ehehe no, I really want something with high battery life. My
Garmin Edge 830 (GPS + touch screen, navigation + training) is very nice, but the battery lasts only for a couple of trips, say less than 190Km, and you have to charge it.
I'd like to use the
Sigma Pure1 as training device, when I don't care nothing but the three most important cycling questions: {
How fast?,
How far?,
How long? } And it does so in a very compact and attractive design, which maximizes the battery life.
Having it installed on a stem handlebar holder instead than on a twist handler would make it more comfortable and more legible during training.