I'll chime in here - I also have playtested Monte's Sorcerer, particularly in the lower levels. For those, it works quite well, and there is very little overpowering going on, considering his balance was to remove defenses and raise the bar on some particularly good spells. One thing that is oft forgotten with Monte's Sorcerer is that the spell lists are skewed higher with support and "buff" spells. He is much more offensively oriented, but is not able to become a chain-hasting fool until 8th level, and cannot even cast the Shield spell until 4th level.
Otherwise, he has class skills that actually make use of his Charisma, known spells are slightly higher (about 1 level higher on the progression chart, and spells per day are the same. If you do use the standard sorcerer list with his alternate Sorcerer, Monte warns that he is far too powerful. His alternate list gives the kind of guidelines you need to incorporate new spells at the correct level for this caster.