I agree it takes some time to reach a good result with a converted style. I am using EMC styleconvert and after that I have to edit and to tweak with all the facilities of my G70 about one or two hours.
Depends of the style, some of them are good after less than half an houre.
Taking out wrong notes , wrong chords, wrong druminstruments, or changing them or exchange them, deleting what is not good and more.
Using the velocityswitch, very much can be done in the Micro-edit of the G70.
It is right that not all the levels of the supersounds of the Tyros can be played on the G70 but many of the G70 sounds do have a velocityswitch and they can be used.
Sometimes it is better to exchange the sounds for a better result. Using the effects can do a lot on the G70 and on the E80 even more. The E80 will have a EQ for every styletrack which the G70 does not have.
This is why I stay to my statement you can have a very good style by using all the facilities of your keyboard after converting a style.
Most of the keyboards, it does not matter from which factory. But they are all a bit different.