As a Bass player who for a good period had a sort of enforced move to something smaller, ie. a cornet; I had to lean on the trigger as much as I lean on crutches!
Being
so used to a 4th valve and a few variations on fingering gining problem free note production on pretty much most of an E flat tuba without so much as twiching a lip muscle; then on moving to the bottom of the cornet range (and of course that's where I started out, in the subterranean depths of playing 3rd!) it was PAINFULLY out of tune! It would have required a whole lot longer before I was lipping anything in or out of tune
that much, to be of any use to ANY band! The AMOUNT of trigger needed always did amaze me though, being used to compensating instruments and 4th valves, it had never crossed my mind
just how much the slides need to move to get a tuneful E flat or C sharp/D flat!!!
As it was (because I was used to the 4th valve action) the 3rd valve slide & triggers on instruments became instantly second nature, and the only problems were being in tune with the other players who wouldn't know what a trigger was if it had beat them senseless!
I now consider myself blessed as I am among those few Bass players who have experienced first hand just what it was like to be
among the 4th section Band intonation problems, rather than just listening to them from the back of the band!
PLEASE make sure your junior players know what these devices are for, we all know great players can work miracles with or without triggers, but at the rough end of the band, it's cruel to everyone with an ear to let them honk away so far out of tune - it's like listening to an original instruments/tuning Baroque Horn Concert! ;-)
Only one problem the triggers produced for me... after reaching the heady height of Rep Cornet, I soon developed carpel tunnel syndrome - holding and operating the triggers no doubt helped that develop. The weight of a cornet coupled with the stress of moving the triggers at the same time just wreaked havoc with me - and I had to move on to ANYTHING without a left hand trigger, as the pain & numbness was too much! 4th valve operation on a big heavy tuba for decades was no problem, and still causes no problem; yet the weight of a cornet with a finger or two in a ring, or on a trigger (I was using both regularly on trumpet and a couple of cornets) and not much over a couple of years was all it took to wreck it!