I have made several projects in the past using these types of pots.
I've used dual gang pots of the same type for gain adjustments in a
dual channel peak/hold LED VU meters.
Bass, mid and treble pots in some guitar audio projects.
What attracted me the most to these types was, as already stated,
they are a sealed unit, have an extremely smooth travel with no noise.
I always purchase mine from
Jaycar and I've been extremely happy with them.
They are extremely reliable, as schmitt trigger has already stated.
I cannot tell of the really long term reliability of these pots, but the first one I fitted over 6 years ago, is still going strong.
Regards,
Relayer