My Forever stems go back to the previous management of the Forever stems outfit. At that time, you could request the stems be cut to any length, so I had some standard length and one left long, an orange swirl stem for a Patriot bowl.
I seem to chew through the soft standard stems faster than most people, and I got tired of replacing them, so I opted for acrylic stems.
In recent years, I have ordered only special addition MM cobs that come with acrylic stems, which cost out less than Forever stems when you consider shipping.
Since I have quite a few pipes, my MM cobs last as long as my briars so far, so I treat them as "permanent party," as the assigned crew of warships used to be called (and may still be as far as I know). That distinguished us from temporary technicians and contractors that were occasionally sent aboard, not to mention foreign nationals like officers in the South Vietnamese Navy.
I would joke, we were permanent, but it weren't no party.