I am just a beginner step up from sealife to M4/3. So, my review does not cover all the professional information, just plain fact about how I feel about this port.

I've been running back and forth between this port and Zen's product. Finally, I made the decision based on all the feedback, flickr's photos and great information that Scott shared here, and of course, the price. I am glad that I did.

The shipping and handling is great, no complain. The instruction and the accessaries came with the product is very well thought for diver like myself are hesitent to open a housing the very first time. The tools come with the package is wonderful, I'll say. Replacing the port took some effort due to olympus's original port is very well set, too well. I had to spend a lot of grip to "gently" pull out the factory port, but it's olympus' assembly line. Putting this new dome in the housing is very easy. But, at the end of putting the metal retainer back took some effort. The retainer is about 3 hairs (I will say 0.25mm) too wide. I filed the edge of retainer a little bit (0.01mm?) and apply a little force to push it in, then voila~ I am ready to dive with this baby.

I took this combination with my new Panny 8mm fisheye to Thailand. It needs some practices for the first timer (for example, myself). I had to get very close to the subject to compose the picture. And, yes, the strobes, I used my two old sealife strobes, (the yellow and the newer black ones... sorry, I am too lazy to get the model numbers). They just two basic flashes, but they worked file with minor adjustment (well, just turn the stobes outward).

It gives me 180 degree of view, at least I feel it that way. I have no problem about focusing. The dome is crystal clear.

I just have a few wish list for Scott
1) please just incluse the port cover in the package. I don't see any reason that any buyer would not spend extra dollars to buy this protector. I put the order for dome, but forget to add the neoprene cover (it's not listed when I order this dome). I'll say, just add it in as a complete package.

2) It will be great to provide the accessories on the web site, such as o-ring and lubricant for this dome. I understand it's better to send it back for annual service, however, I believe divers would like to have extra o-rings and compatible lubricant around.

3) well... I just hope to see more sample photos for self learning purpose.

I will recommend this product to anybody.

Before buying the Precision Dome, I tried the Zen dome (300 bucks more expensive).
I can NOT tell the difference looking at pictures taken whit both domes.

Pros: Very sharp, compact, fast focus, acceptable corner vignettes, fits in any bag, neoprene cover is included.

Cons: some imperfections on the black plastic case, glass easy to scratch, hood screws get loose (allen included).

Bottom line: The cheapest way to get real Wide Angle UW photography, the extra $300 for the Zen port won’t give you extra image quality although Zen it’s better looking and more resistant.