How good is a Manastone really?

[VincentVolaju]

So is there really no point to having a Manastone once Kunark comes out? I mean, when Kunark comes out will everyone always be there and not in Classic anymore? Is there any point of doing stuff in Classic where you can use the manastone, after Kunark is out?

Also little off topic but how much will a Fungi be worth when it comes out? Im wondering if maybe I should just sell the manastone now for pp, or trade it for a fungi later?