I did some work with PowerBilt when they launched the driver so whilst a bit biased, do have a bit of insight.
It is a great driver. All the tests that were done at launch showed a significant increase in distance. In an independent test by several different members of the U.K. media, every player hit the ball further than with their own driver, with the biggest increase being 27 yards. As well as distance, it won 'straightest on test' on the TG driver test last year.
The problem, as stated above, is that very few pro shops took a chance on it. The distributor even offered a free club for Pro shops to trial. Even with this, very few took them up on the offer.
I just think that it arrived at the wrong time. It was launched in the U.K. just as the golf industry started tightening its belt. This led to many potential stockists being less prepared to take a chance on a new brand and to keep their orders to the big brands that they knew would sell.
A real shame as I do think this is a great product. An up side for everyone now is that if you are prepared to take a bit of a chance and order on the internet the prices have come right down for what is genuinely a 'premium' product.