I do not know if you have read my recent post about the DS: it is two chronos in one watch.
Other chronos do not stand the slightest chance if you want an accurately scaled, accurately running and
utterly useful chrono for measuring AND comparing 30 minte intervals.
I am not a chrono person BUT this one would be the only choice for me.
Sadly it is out of my reach, but again: that is a chrono.
Best
Moritz
As the absolute pinnacle of chronograph movements! A technical tour de force -- and gorgeous to boot. I love mine a lot more than I thought I would -- and I expected to love it a lot!
Best,
Gary G