@isosloth I assume that you mean you've found a Dynamic Steering Rack for a good price, and not something to do with DCC (Dynamic Chassis Control) which is active dampers.
I think it's a great upgrade, big reduction in the amount of steering input required to go from lock to lock. This graphic is from the self-study program.
View attachment 327533
Non-linear as
@Blade3562 mentioned. Something to consider if that matters to you.
If your car does not currently have driving modes I believe you can use VCDS/OBD11 to change the mode for the steering rack. On my original rack the difference in modes was subtle (enough that it might have just been placebo, haha). Oh my dynamic rack the modes are very different... So much so that I first thought something was wrong in Comfort mode. I only use Sport mode for spirited driving. Out there heaviness feels good but I find it annoying day to day, haha.