My new pair of sai from Phil Worbington arrived last week, and I've had some time to evaluate them.
My first pair had been made by Phil Worbington from the 1/2" steel, and have been wonderful for me throughout the last year. Unfortunately, I realized that after training for 2.5+ hours in a couple of sai clinics earlier this month, that I'm not exactly 18 years old anymore, and that the muscles don't recover from such training nearly as quickly as they did before. That, plus the old tennis elbow started creeping back.
So, I had a new pair made by the same fellow, although this time, using 7/16" steel instead of 1/2" steel. While a 1/16" difference may not seem significant, keep in mind, that geometrics will dictate that the reduction of the width in this case, results in a 23.4375% in weight, making a significant difference in flipping speeds. After all, volumes are calculated according to the square of the radius...
The quality is still the same, and the balance is perfect, since these sai were made for my arm and hand dimensions. Durability looks to be pretty darn good, although these aren't going to be used for sai vs bo demonstrations (I'll use the 1/2" pair for that, since they've been tested already).
Still, for daily training, and for extended sessions, I can already feel a difference between the two. My elbow no longer aches, and I'm getting a significantly faster recovery speed when flipping the sai out and back, which certainly helps in kata. I had thought that I was already getting some nice speeds with my 1/2" pair (due to the better balance, compared to the clunkers from Century), but these are even nicer.
If anything, the only things that ache are the larger muscles, from regular training, so I'll take that as a good sign of things.
I'll have some pics put up later, but basically, they look very similar to the ones that he has listed here:
http://worbingtonsteele.com/images/7-2006_061.jpg
Overall, a very worthwhile purchase. These feel even better than my old Shureido "natural" sai (that were stolen from me a long time ago), and the customizations that are done make this truly something for the individual.