I just had my hotchkis installed this weekend. It feels really good.
I can probably compare the hotchkis with the eibach sway this weekend. If zero, let me test his car out.
(just playing)
Here the specs for the Hotchkis.
Front Sway Bar
35mm (Ø1-3/8") Hollow
Hole 1 = 205% Stiffer than Stock 370Z
Rear Sway Bar
27mm (Ø1.063") Hollow
Hole 1 = 40% Stiffer than Stock 370Z
Hole 2 = 75% Stiffer than Stock 370Z
Hole 3 = 120% Stiffer than Stock 370Z
.....Anything is better than stock.