Been playing with a Prince O3 Red (original) for about the past year. Currently, strung with Prince Beast XP 16 at 57 lbs. (well, for a couple of weeks anyway - it seems to loosen up pretty soon after stringing) I like the manuverability and power, but the control and racquet stability on a hard serve or passing shot can be a problem. I realize at 10.5 oz strung that it may be unrealistic to expect anything else. I did have a bit of arm/shoulder issue with it at the beginning from vibration on off center hits (mostly overheads near the tip of the racquet), but some improvement in technique and a Gamma worm dampener seem to have eliminated comfort as a problem. I had no issue with the older technology back when I got the O3 Red as I was just starting back up after 10 years off from tennis. Now that I'm playing 3 times a week and improving (3.5) I'm considering an "upgrade". I'm looking for something with comparable power to the O3 Red, better control, more stable on off center hits with better touch/feel. As I'm going to be 50 this year, comfort is important too. Hope to stay around or under 11 oz for weight. Head size probably no smaller than 98 sq in. When I play singles, I tend to stay on the baseline, but do play doubles about half the time, so I spend some time at net. Eastern forehand grip, Continental for everything else. I hit a two-handed backhand. Looking for some suggestions for demos.