I have spent literally well over $300,000.00 on professional HD gear. As an owner of the Sony F-900 HDcam, Amphibico HD housing, Fuji lenses, and accessories from every manufacturer that you can imagine, it has occurred to my-that I am always a 'Beta-Tester'.
I also own the Phenom Housing along with the Z1U and I'll be honest with you all, the small amount of flaws with the housing is minimal compared to it's advanvantages. I was one of the first owners of the F-900 camera and was told by Sony about several features that it would have. Well, once delivered, to my surprise....it didn't, but I dealt with it, adjusted, and shot. Professionals in this industry are used to this.
The Phenom's price CANNOT be beat. Learn what it can and cannot do and adjust. This is film-making 101. Yes, it vignettes, but it is still wider than the flatports that the other manufacturers send standard with their housings. I have an $8,000.00 matte box for my 4.5 wide lens and wouldn't you know...it also vignettes. Don't let it stop you from shooting. A true artist can adjust, get a feel for his gear, and make beautiful pictures. The F900 stops grabbing white balances after 10-15'. So, I've learn the art of color manipulation in camera and color correction in post.
I commend some of the talented individuals whom have modified and advanced the features of the Phenom. Most professionals who understand their gear (yet cannot manufacture it themselves) do modify and change things that the manfacturer hasn't. Heck, spend some big bucks with Sony and see if they will answer your calls or play the violin for you when you bitch about their product flaws. Everything i own has some sort of modification. You think that IMAX housings have all the bells and whistles? Nope.
No housing on the market ( regardless of the price ) is 100%. But I know several operators whose skill and talent are so exceptional that you would think that they are shooting with something really special. Spend the time that you would be complaining about the things that are wrong and maximize that time to perfect all that is right. Your pictures will change and your skills will become extremely valuable.