In reply to TobyA:
btw, you can find a nice comparison of most of the current models here:
https://beaconreviews.com/transceiver_reviews.php
I would agree with Floquet, intuitive use (and rehearsal, but you probably have that cornered, as seems from your post) is a must.
On one training, we had one user with (older) transceiver, that exhibited a slight problem in the field. The switch from search to send was so easy to move that once they started probing and digging, just stuffing their transceiver under the jacket in the heat of the moment caused it to revert to send a few times, causing quite some confusion among the other searchers. I don’t remember the make and model, though, apart from it being one of the older 3 antenna types. Just makes a point about ease of use and real world testing...
Post edited at 21:22