I'll tell you from my experience by Oly C-5050-Z with PT-015 and Ikelite housings.
My strobe is also ikellite (DS-50)
outlawaggie:
1. Can you use full TTL with the Oly pt-023 u/w case ?
I think the manual settings are much better. You can get 4 of "My Modes" for low depth with Aperture 4,5 with faster speed (1/125) and increasments of the strobe-power (1,3,4,5). The other 4 "My Modes" for more depth with Aperture 4, lower speed (1/100) and much more strobe-power (6,7,9,10)
Try them with an exteral strobe in a room with TTL and with Manual settings.
outlawaggie:
2. Is the Ikelite case worth the extra money over the Oly case?
Yes. The new one has special conversion circuitry. No more optical sensor (and back-skating) !
http://www.ikelite.com/web_pages/oly_8080.html
Or you must wait the Great INON to make something for the PT-023.
These strobes are excellent. But take care : You need to know about PT-023 and electrolysis. Are these housings safe ? Do they taking water in the buil-in connectors for the external strobes ?
Here is what i mean about INON and PT-023 (to wait something as for PT-020) :
http://inonamerica.com/news.html?news_id=12&newscat=0
outlawaggie:
3. I'm interested in this camera due to it's built in ability to take a wide shot, to zoom, and to Macro. Comments ?
The camera angle in the sea, is getting shorter.
For wide I dont know if there are real underwater lenses. INON or something for matching with ikelite housings, as the INON UWL-100, with the right material-coated.
For Zoom you will need 2 strobes.
For macro you wiil need an external strobe (one). Otherwise your build-in flash will make a shadow cause of the lence.
Or you must turn it to macro (not super-macro) then get more distance and "play" with zoom.
outlawaggie:
4. What is everyone's general opinion of this camera underwater?
If you have the neat image -or something- for the noise reduction, it's OK. Oly 8080 is the best camera at 8 mPixels.
Take a look :
http://www.ikelite.com/web_pages/triv_yochens.html