[Witchking]

I have played with Powerstones mostly and do prefer them...however on a world building note since they can be used by anyone and can be MADE...they are de facto an economic commodity.

I have played at least 2-3 PC mages who derived significant income while adventuring by using the Q+D enchantment rules to make powerstone for later sale...

A GM should be aware of that potential...

However without Powerstones there becomes very little reason for a PC Mage to ever bother with Enchantment spells in most campaigns.

Powerstones can also make a nice loot item for Mages who may not lust after a pointy stick...