Piratecat said:It's designed to be the same thing as ECL races, but spreading your xp and hit point penalty out over a number of levels. That way you can play the equivalent of a high ECL race and not have 10 hp when everyone else is 5th lvl. The tradeoff is that your abilities arrive more gradually.
Personally I don't think I'd use it myself, but I'd allow it if a player was interested.