Manning wasn't treated any differently than any other maximum-security detainee, especially one displaying signs of mental illness. He was kept under suicide watch for the first six days which included being held naked until he was deemed not a risk to himself. The rest of his time has been in isolation.
Manning has entered a plea which, if accepted, would subject him to a maximum sentence of 16 years. According to AP reporting:
"Earlier Thursday, a military judge, Col. Denise Lind, accepted the terms under which Private Manning would plead guilty to eight charges for sending classified documents to WikiLeaks". The judge’s ruling does not mean the pleas have been formally accepted. That could happen in December. But she approved the language of the offenses to which Private Manning would admit, which she said would carry a total maximum prison term of 16 years.
Manning may have a legitimate complaint for a "speedy trial" appeal but he will have to deal with the fact that the defense team has also asked for delays. And he should be thankful that the extended investigations into his motives and the motives of the recipients have apparently removed the charge of treason from above his head. He could be facing life in prison, or DEATH!