It looks nice, but I'm not sure how many people will pay $1,300.00 for a P&S housing. You can get an Olympus E410 DSLR with a 14-42 lens and an Olympus housing and port for not much more than just the price of that housing. Of course that is probably list price and it will sell for less, but still.....
The more third party support is given to the G9 (I own one!) the better. With companies like Sea and Sea and Ikelite wading in, it will mean more options in terms of supplimentary lenses, mounts, adaptors, etc.
Interestingly, I think its the first time Sea and Sea have supported a third party compact without 'rebadging' it as they have done with Ricohs. Its a bold move as supplying a housing for the G9 puts this camera in direct competition with the DX-1G (a Ricoh)...
Sea and Sea made a great housing for the Coolpix 5000 and 5400 - back in the good 'ol days :-)