depends. are you playing an epic campaign? if so, then no it is not overpowered. if not, then likely yes.
as i recall they have dr something/epic, not to mention the dual brilliant bastard swords which cannot be lost, taken, or broken (effectively) and can be summoned and un-summoned at will. and some other minor tidbits.... ^^
now if you slanted the progression such that they gained all of the epic abilities after 20, and the rest of the abilities scaled appropriately with wealth and power level and so forth, then it could be made to work. might be interesting to make an immature leshay. considering the racial backstory, one wonders if any of them would bother to procreate, or if the individual has been around since that event.