Our rationale here is to have a written procedure for current practice on each piece of kit. Then it's less important who is delivering the training, because the content of the training is defined. This avoids the 'chinese whispers' issue.
In practice, we get the company in to train when equipment is new, then further training is organised between senior nursing staff and critical care techs. The great advantage of getting the company in is, of course, that they bring cake.

Moira