Just that it gets +1d6 sneak attack. Many people seem to confuse the +3d6 as be in additional +3d6 instead of seeing it as +2d6 (the prequite) to +3d6 so a gain of +1d6.
You must be reading a different post then I did to get that out of what he said.
To address that, the prequites are not that bad considering the power of this class. You get both sneak attack and full spell level progression. That ain't to shabby.