I had the pleasure of riding the new 5'4 T Rex today. The first session I was on 2014 SS Rally 10m, lake waves ,3ft mushy,wind 14-18 knots ( guess, powered up nicely). Session 2 was on a 8m SS Rally in 20-25 knots. I used the T Rex with a Quad fin set up. I'd never used a Quad before,always thruster. I really like the feel of the quad. A little tighter. Great upwind! The Rex has excellent speed(actually didn't think it would be that fast). Very easy to ride, great balance. It rides bigger than it looks, I would say like a 5'8. No issues gybing, actually a little forgiving on some sloppy foot work which was nice. The board is very easy and quick in cut backs, which was one of the best features.
Overall, very happy with the size. Being 87 kg, I think this is a great size in med-high winds like today. It never felt to big. Next time I will use a different fin combo to see how the feel changes.
As for the hanging 10 in the video, The best I got today was 7, thats 5 toes and 2 fingers as I'm getting pitched over the (thankfully) square nose...lol. A sharp looker, the T Rex got lots of attention on the beach!