Sorry Larry,
My bad for getting off the subject.
For me personaly the answer is no. No particular trumpet brand / design has allowed me to 'not' have to practice to get over hurdles. All things being even (as in any partucular model trumpet being well made) I can only do what I can do. What the horn does for me, is help me best get the sound I hear in my head out the bell.
In that respect I think the horns have made a difference. Helped some with endurance because I feel as though I'm not working as hard to get the sound I want.
I'll be very interested to hear others observations! We're all different and pick our various tools of the trade for reasons.