Cornering is a lot better. Much more traction out of the turn.
My car is a road race/drift car. So this helps a lot.
I can get to full throttle about half a second sooner than I could with my regular trac loc when leaving a turn.
It locks tighter because the packs will be a little thicker and put more pressure on the spring. If you want it really tight, throw a space behind the pack too. Just make sure its not too thick as it will bind your spider gears. I would keep the packs within .10" of the stock thickness reccomended in the link I posted earlier.
The main point of the +1 mod is durability, as my trac loc's usually go out after 3 months or so. Power and traction will eat the stock trac loc in a heartbeat.