First, sorry for poor spelling, cause English isn´t my first language, but this discussion is exactly what i´m looking for.
I´m playing a hexcrafter bladebound Magus (Strengthbuild) in Carrion Crown.
After we solved the "Trial of the beast" our group was shopping for new items and the GM rolled for an RoW I in the shopping-list of Lepidstadt. So my 7th to 8th level Magus had to chose between an very early RoW or a handful pearls of power. By the way, our bard rolled critical on diplomacy, so i could buy it just for 3/4.
After I read the posts of you guys, I chose the Ring, because of the versatility that it gives.
I have preferred spell (shocking grasp), Magical Lineage and intensified.
So like MTCityHunter says, I can spam it like there is no tomorrow.
Preparing 9 different spells is in a campaign like CC, were are so many different types of enemies, not just awesome it´s necessary.
And my GM wouldn´t allow to recall a spell with a pearl, which I sacrificed for an shocking grasp.
P.S. @Walter: Thanks for your awesome Guide. The Magus I build with your Guide´s help made my GM envious. He plays also an Magus in another group. ^^