Wizard of the Spiral Tower does seem pretty clear, in that it requires an Implement Mastery for Corellon's implement. However, I think they should have mentioned Implement Mastery in the prerequisite list, to avoid confusion.
My only complaint related to this is that that the Multiclass feats set a false expectation, and tell you that they open up Paragon features for your character, but in reality many of the Paragon paths require class features that you can only gain by having that class as your primary class. Still others, you can technically take, but they'd be virtually useless without that primary class.
I'm ok with some Paragon Paths being exclusive to one class, but then you get the class like the Ranger, where every Paragon path requires the main class.
But back to the original point, I think that a lot of people are upset about 4E's philosophy of distinguishing characters. You can't easily pick up core class features from another class through a multiclass level or feat. There are always going to be advantages and disadvantages between picking a Warlord/Wizard, vs a Wizard/Warlord.
My only complaint related to this is that that the Multiclass feats set a false expectation, and tell you that they open up Paragon features for your character, but in reality many of the Paragon paths require class features that you can only gain by having that class as your primary class. Still others, you can technically take, but they'd be virtually useless without that primary class.
I'm ok with some Paragon Paths being exclusive to one class, but then you get the class like the Ranger, where every Paragon path requires the main class.
But back to the original point, I think that a lot of people are upset about 4E's philosophy of distinguishing characters. You can't easily pick up core class features from another class through a multiclass level or feat. There are always going to be advantages and disadvantages between picking a Warlord/Wizard, vs a Wizard/Warlord.