The new SLDR driver has a lot of significant changes than others
Now with the SLDR driver, the moveable weights in the heel and toe and the dial on the sole have been replaced with a single sliding weight in the 460cc titanium head.
This reduces the weight of the SLDR driver and makes it lighter so that in theory you get more clubhead speed from the same amount of effort. They have also moved the centre of gravity (CG) closer to the face which also increases ball speed, although this can also increase dispersion and reduce accuracy.
TaylorMade are promoting the SLDR driver with the line of 'more distance through more loft' as the head creates much less backspin than other models. This allows you to play a driver with a higher loft, which in turn makes it more forgiving and easier to hit and this is really the key benefit of this driver.