I think it should depend on the severity of the crime. Murder or possibly malicious wounding would be two crimes that I think should definitely qualify. For a crime where no one was hurt, it should be based on the circumstances of the case.
I think the major issue that should be addressed is how the juvenile justice system fails the juvenile offender. In 1994, my father (a deputy) was killed by a 15 year old boy that had been in and out of the juvenile system for years. We discovered that he had been before the same juvenile judge 13 times, and each time had basically been given a slap on the hand. He'd spent time in "juvi," but not much. He told someone that he was going to kill the next cop that tried to take him to jail, and he did. Unfortunately, it was my dad. My family spent almost 2 years attending court hearings for this boy, in which the prosecutor was trying to get him transferred to adult court, and he eventually was. Ironically, the same juvenile judge that had slapped him on the hand 13 times in the juvenile system had been transferred to adult circuit court, and was the judge that presided over the hearing and the sentencing. The boy pleaded no contest, and the judge sentenced him to 42 years in prison. He is currently at Greensville, but he has been in Wallens Ridge, Red Onion, and Sussex II.
Had the juvenile justice system done what it should have, my dad would not have died in the manner that he did, and there possibly would have been no need for this boy to be sent to an adult prison. Do I think he'll be reformed? No. I know that he's stabbed someone in prison. He's had 5 additional years added to his sentence since entering prison in 1996. IF he gets out when he's scheduled to now, he'll be 40 years old. How is he supposed to acclimate into our society then, after he'll have spent over 2/3 of his life in prison?