I have them on my Commando. Makes it possible to
position the master cylinder around the instrument
housing so that the brake lever is still usable.
The couple different non-adjustables I tried didn't
work so well in that regard.
The big allen heads that allow for adjustment have
set screws, but they will still loosen up after a few
months. I suspect it's heat cycle induced (warm days,
cold nights).
I believe they can be used in 2 configurations, one
with 2 parts per side and one with 3 parts per side.
Having the extra little adjustment arm gives another
degree of freedom in positioning.