Ok, I play a bach strad 180 37. I know of other people who have bach student horns TR200's and 300's. Now I am not a beginner, I have played their horns and mine. I feel the difference, I hear the difference in intonation and sound. I know that they are different. But heres the stupid question what exactly is physically different from the strad to the student models? They look similar but I know that means nothing, I was just wandering where the physical difference is that makes the strad so much better than the student. Thanks.