Little bit of both tbh mate...
Found it made the front end quite stiff and caused the ride quality to get towards being uncomfortable for the rough roads round by me, the increase in torsional strength seemed to make the front end lose its compliance over bumps, almost like the bar was too stiff and causing the opposing wheel to overreact to bumps?
As for the rear end it made it very lively which on a bumpy wet road made life VERY interesting lol! Handled great (I always run front soft rear hard) but almost made you slower as you had to be careful not to lose the back end..
Saying that I was only running WALK, trans mount and VWR springs with OE dampers which may have not worked as well as possible with the larger bar?