The "soft touch" accessory changes the geometry of the process of releasing the shutter. Some people find that it allows them to gently "roll" their finger over the release + accessory, rather than having to push the release, and for them that is better.

In my case, because the release is now taller, it permits me to use my low-dexterity right hand to take the photo.

Unfortunately, I have no end of trouble with a couple of my cameras - the accessory releases won't stay on, and I lose them!