Anyone who disagrees is a Terrorist...
Cthulhu 2020 Never settle for the lesser evil...
It is interesting that they seem to insunuate that dilettantes of sorcerers and Favored souls are treated as level one sorcerers and Favored souls.
The key different is that you do not get the spell point doubling effect from the items.
You don't anyway, even if you take a single level of either class. It's a more complicated formula, with the extra sp multiplier being based on the percentage of Sorc/FvS levels in your build. A pure Sorc/FvS will get double sp from items. A Wiz19/Sorc1 will get something like 5% extra. I may be off on the number, it's late and I don't remember complex formulas (or simple ones.. or my name) when I've been up awhile.
It's a single level of a class for item usage. Meaning you can use any Arcane/Divine (respective to each class) Wand, and can make a caster check to use a scroll (with horrible chances of success, UMD is still superior here). I see Sorcerers taking FvS for easy access to wand whipping in the early levels, later they can get UMD high enough so as to not matter. Paladins can take Sorc for Stoneskin, Shield, and other useful wands. Monks can use the Cleric one, etc... The only ones that are almost universally useful are Rogue (+1d6 SA is handy no matter what) and Fighter (full martial proficiency? Yes please).
Anyone who disagrees is a Terrorist...
Cthulhu 2020 Never settle for the lesser evil...