I used to use a 10b4 for normal playing, then a 10a4 for marching. Then I got a solo in field band, which was supposed to be on a flugel, but as we all know flugel+30 degree weather=super flatness. So I switched to a 3C Megatone on the recommendation of my director, and now I can't get a half decent sound out of the smaller pieces. I know they're not necessarily "cheater" pieces (the 10a4 is a picc piece, i believe) but I was playing quite well on them, just not as well as I could have been. I think if you achieve a desired tone on the piece and are able to play it well in all aspects, you should use it, whether it's a 1c or a 6a4a. I don't think anyone should be limited by the conventional pieces just because one is considered a "cheater." Honestly, if you had two, and the ONLY difference was that one added half an octave to your range, which would you choose?