CS2? Should I?

I was wondering if I should upgrade to CS2. I have a friend that bought it and it ran slow on his pc and now reverted back to Elements. I hear you can transfer the registration but not sure how that works. Mainly, I am wanting to know if it is better that CS and what was added or changed to make it better. Sell me on it, if you do, then I will look into the whole transfer thing.