Expect the PDR to have more of a crisp feel on contact and perhaps a little more pop, especially on volleys and serves. A softer frame like the Volkl C10 (stiffness rating also 63) gives me more of a "bow-whup" feel of the frame flexing when I hit a groundstroke while my stiffer ProStaffs have more of a quick pop - like the ball is leaving the stringbed a bit more quickly. Around the net, that crispness can be a more welcome feel, but from the baseline, the more flexible racquet has less of a harsh feel with an off center hit. In either case though, when I catch the ball on the sweetspot, it feels really nice.
The PDR is a pretty decent frame and you sound good and ready to give it a home. Because it's a different racquet than the one you've been using for a while, try to get a couple of low key hitting sessions with it before you play a full speed match. That ought to let you make some adjustments without piling on a lot of mishits - regardless of the frame you switch to, a lot of those mishits with an unfamiliar racquet can really irritate your arm.
A pal of mine has used the PDR's for a while and he was fine with them until he decided to switch to poly strings. Suddenly he got a real case of tennis elbow and after a break and some therapy, he could start playing again and when he did, he also decided to stack the odds for success in his favor and string those same frames with full natural gut - he uses 16 gauge VS Touch. After being back at it for several months, he has no new symptoms and his game is back to rock solid - he's a former college player with pretty sound strokes and we have really fun, heavy workouts. From what I've seen among the people in my tennis circle, I'd only caution you to stay away from the harsh strings like poly or kevlar if you have any concerns about staying healthy and take a little time getting used to your new stick.