Before I even bought the pro version, I found JS had posted CSS code in the support forums for exactly the improvement I was seeking, which was a greyscale/opacity effect on mouseover for the social buttons so they didn't jump off the page of my dark grey theme. I pasted the code in the social button CSS and, voila, instant muted buttons that light up with color when you mouse-over. Another gratuitous "little" thing that means a lot.
So I bought the pro version, which not only allowed me to get great looking, custom controlled twitter cards and descriptions for FB likes/shares but allowed me to support a wonderful product and developer. Had a couple of other support issues that JS responded to with exemplary speed and proficiency. Highly recommended.