The main reason I want to upgrade the psr-740 is I want to work more with user styles and to be honest the psr-740 is pathetic in how it handles user styles. I know that the psr-740 is a good keyboard, but it does hinder my ability to work with user styles. I am happy with several sounds on the psr-740, and I have a motif rack to compliment the 740's sounds that in my opinion falls a little short. Also, I was using a Studiologic SL880 88 key controller with the Digitech Vocalist VR in conjunction with the psr-740. I really want the capability of having many user styles to work with.