For people who are interested in the effects of different trainer levels on training speed, I'd encourage them to sign up for the training analysis project as described here:
(203921.1).
So far there's already excellent information about different training types and their speeds, height effects, and age effects. One thing that isn't yet clear from the data is exactly the effect of trainer levels, but, with more people submitting data, the sooner we can make firm conclusions.
If people would pass that link along in their country specific forums, that would be great too.