Why do I make such an assertion?
Because i paid $15 for Trumpers roll-on deodorant ten years ago, I first used it ten years ago and in-between then and know - and it is still working fine. As a bonus, it is actually an antiperspirant.
During that same time period I have opened and used dozens of Rexona, Mum, Mitcham, Nivea for Men, Addidas and other roll-on tubes, and they have all dried out on me long before I used all the content of the bottle.
Do you know of any other manufacturer that can match the performance of the Trumpers roll-on tube?