My wizard and Spugnoir reached level 10 so I thought why not craft an ioun stone or two. didn't realize they go to the belt slot and not the head slot LOL. I prefer the party use the belts of giant strength they already have. I mean you can get bigger stat boosts from the belts, gloves and headbands that are craftable way before level 10. The only one that I thought may be useful was the ioun stone for +2 wisdom (to increase will saves for some characters)or the one that gives +1 to AC. Still there was no way I would give up the +6 strength belt on any of my characters. It was pretty easy to outfit all the party with +6 strength belts resting in the Temple areas at character levels 4 to 5. Killing a few trolls generates quite a bit of xp at that level and then pickpocketing Burns and selling him back his blue sapphires generates enough pocket change .