Finally got my Titan this weekend and I love it!!!
1st impression: rock solid, well built, simple and effectively executed housing. Controls almost every camera function, but does not control on/off.
I've been waiting around for this housing for a few months, and in that time I became very familiar with the E20 that it houses. This made the learning curve a little quicker.
Posts on this forum have expressed concern over the macro function of this camera, its ability to focus in low light, and the standard lens' range. I dove this unit for over 8 hours this weekend, and I can say that the AF is quite good. I really didn't have any trouble even shooting lobsters backed up in a hole. The macro ability of the system is more than adequate. In fact, I had a macro lens on order and may cancel it since out of the box I got good results. It seems that everyone reads Olympus' claim that the macro feature allows you to focus on objects inside 8" from the lens, and interprets it to mean not much inside. Out of the housing, it focuses quite well inside 4". In the housing, I never got close enough to any critters to have difficulty focusing, even on a semi-closed rebreather. I think the macro function of the system is very good.
The only disappointment is the wide angle ability of the built on lens, which I hope will improve dramatically with the wetmate wide angle lens. I'll post an update once I've received it.
The image quality of this system is exceptional. I cropped and blew up images to 8X10 and got very good, photorealistic prints.
I love the system, and it was worth the wait.