Depends...I think it's a very personally view. Some can justify the price for the greater speed.
Pros: speed, ram chips, and silent, no moving parts either.
Cons: Degradation of the chips over time (they get slower with each use, but it is not noticable.) I think Der Meister ran into this problem after 1 year of use. And also, the most obvious is the rediculous price per gb.
I personally can't justify the price for a large drive. I may get a 30gb one over the summer for my operating system, but solely the operating system.