It will definitely feel "more solid".
Regarding the anti-sway bar, you don't absolutely need one on the street, but it will certainly make the car handle better, especially if the rear is Swing Arm. Most street cars would benefit from a bar on the front of, say, 3/8" - 1/2" thickness. More than that and the bar begins to transmit road vibrations to the rest of the car (and you).
I have a 3/4" bar at both the front and rear (IRS rear). It handles like a banshee BUT seems a bit stiff (my wife is not thrilled with that). Most everything on these little cars is a trade-off.