Definitely worth it
Dinan Shockwave and Dinan suspension installed last week (550i xDrive Msport). Huge improvement. Feels like I have my E60 Sport suspension again. Now the torque of the F10 v8 seems to fit the chassis. As others have said, this is how a "sport" F10 should have arrived from the factory.
In the Sport settings, the F10 xDrive steering (hydraulic) does tighten up. With Dinan enhancements, steering feel is improved in every setting but that is probably due to better road feel and the responsiveness of the suspension.