Hit my new 21 GPro last night, pretty good stick. Reminds me a lot of my G360+ Prestige MP but a bit more forgiving. Power, control are similar. The best shot with the GPro is the backhand slice. It hits a low, flat penetrating backhand slice really naturally. The launch angle is pretty low like the Prestige MP, really have to get under the ball and brush up the back. I was also hitting a bunch of serves into the net, had to change my serve grip a bit to clear the net.
Was strung at 46 (probably around 42 lbs) with 18 gauge hyper G soft. I may restring and lower the cross tension to see if I can get a bit higher launch angle. I did change to the leather grip at the end of the session and it felt a bit more maneuverable which I liked. My stick was under spec at anyway so this worked out well to get it to about 341 grams strung with over grip, dampener after the head leather grip was swapped in.