I saw that even the Race Tech upgraded unit has an Eibach spring on it! Anyway, the stock Gold Wing spring is nearly 200# over our stock spring, so you are getting a spring update, as well as (most likely) internal damping that better suits you, since the heavier spring works so well with the stock setup. I'm working on my purchase as we speak, and will be converting in August, next time I get to go Home to Texas.
I'll absolutely post up when done.
I will be doing Race Tech Springs and emulators on the front after that.