I have both, they are a little bit more stable , If you felt that you had issues with the older ones it may be worth it, I have one sled with the old style and one with the new style . Both sleds are set up different and I like the way they are and won't change them.
I do run with 1.5" lower spindles now and have the stock updated set if you want it $175+ shipping for the set . I paid $250 + shipping.