Kinklab Lube Shooter Smoke or Red or Blue
There is not much to complain about this lube shooter.
However, it is a bit silly to come with 3 lube casings (that essentially never spoil) and just one plunger. The one plunger, of which the rubber easily spoils, is thus the lifetime-limiter.
Of course, it does also mean that the other casings allow you to ignore cleaning issues for a while when in the heat of the play.