A front strut bar will make things stiff in front. It helps but I felt their was a minor amount of added understeer. It may have just been mental. A good strut bar does work but doesn't make a big difference.
I don't know about that particular rear sway bar but my Acura TL bar did a good job of making driving more fun. Again, I believe the strut bar added some understeer, and grippier tires on a car that understeers only seemed to make it understeer more. The RSB made the car feel more balanced. It still understeers but it is much more neutral.
That said, after lowering and adding good tires (not just low profile Kumo's), you really don't have a lot to gain with simple upgrades. I have driven cars with pretty hardcore suspension setups and some had stock everything else, some upgraded every component you can. The cars that had more done didn't necessarily handle better but were much more fun to drive.
I had an experience to drive a road race Talon Tsi AWD once. It wasn't that crazy in terms of handling, compared to some hard core street DSM's I have driven. But, the balance of it was crazy, everything felt just right. Everything was adjustable on it and it was raced frequently so the suspension tuning is what really made the car. That's why some of the better shops actually will tune popular suspension setups. It isn't about being slammed at all, it's all about applying their racing background to street cars.
Oh, and end links won't do a thing, as long as your stock ones are firmly in place.
