So they're extremely overpowered? Mmmmmm... Well, in this case, I'm the only one learning all the rules and explaining them to them as they make their characters (more or less as usual), so the chances they make an overpowered character seem rather low.
Besides, I'm going to be brutally blunt here - I can optimize circles around my players. And they know it perfectly well. So they generally don't try to overpower themselves too much - they know I'll catch them, that I'm a thinly reformed powergamer, and that I will either ask them to tone it down or take it as a challenge .
But eh, as said, I will just get other books anyway.