I think perhaps the day of manufacturers being interested in having pellet pits tested has passed. Hundreds of thousands of people have now been exposed to them and seen them at big box stores, they are no longer an oddity that folks have no clue about. Also, members of forums like this provide a wealth of info regarding all aspects of pellet pits. In the last year, I have contacted 5 manufacturers about potential testing of their new lines. All have been very polite, but non-committal.
Also, the technology is changing so fast that a review can be outdated in just a couple of years. All you need to do is look at the reviews that Bent did of the Memphis Pro and GMG DB for PH in 2010. They were cutting edge at the time, but have no relevance vis-a-vis what those companies currently produce.
At this point, I would prefer to focus on product testing -- either member reviews of products or even member funded products purchased for review.