Last year I bought a Ambon Retic female. In a short time she went from 16" and eating mice to over two feet and eating rats. This was probably over three months. She had the nastiest attitude. Jay Brewer from Prehistoric Pets looked her over and said that she was one of the meanest snakes he had ever seen and handled. He also told me that Ambons do get large males and females and they rarely calm down. He told me that I could (especially since it was a female) end up with an 18' mean ass snake. I owned her for a few more months then sold her. I have since yet to hear of a nice, tame, friendly, or calm Ambon. If you want a calm handlable retic I would consider getting a captive bred/born snake and remember that patients and time is VERY important when calming baby Retics. If you want something small get a Jampea. They stay small, are beautiful, and are usually calm.
Good Luck,
Chirstine