I have been shooting my e-330 for 2 months now, and taken it on about 60 dives and taken over 5000 pictures (I've been busy in Bali on an internship ;-) and plus I've got a learning curve to climb...). This was my first step into dSLR and even SLR photography. previously I owned an Olympus c-5050, but I had only ever used it with the pt-15 housing, no external strobe, and shot mostly in Automatic mode. Things like Aperature, f-stop, shutter speed, etc meant nothing to me. So basically my e-330 was jumping into fresh water. I liked the quality and ease of use of the c-5050, and what I perceive as Olympus' attention to underwater photography, so I remained brand loyal...
I must say that I am very impressed with this camera, the design, picture quality, and the ease of use. I primarily use the 50mm macro which I think is great. I also use the 14-54mm zoom which I am also very happy with.
I use this camera in an Ikelite housing with a ds-125 strobe. Mostly I shoot in TTL mode which I have been very happy with. The in-housing TTL adjustments allow for fine tuning which I appreciate. RAW adjustments in post-processing seem to take care of the rest of the issues with exposure. For 90% of my shots I use the LCD live-view. The resolution isn't as clear as the view-finder, but it is certainly more convenient, and I think it allows for capturing tricky, finicky subjects much easier than using a view finder. The focus lock light tells me that everything is in focus, so this compensates for the lower LCD resolution. I shoot in Manual mode, mostly adjusting the aperture to suit my needs at 1/160, ISO 100 for macro. I practically consider this camera point and shoot, but the images that I produce are definitely professional. I must also say that my approach improved drastically after a one day underwater photo course with Jeff Mullins in Tulamben, Bali. He really helped ratchet me up several levels very quickly. Fortunately he uses the same camera (albeit in a 10bar/fantasea housing), so this lesson was ideal for me.
I spent a lot of money on this set-up, but I consider every penny worth it, and would highly recommend this kit to anyone that isn't already familiar with shooting SLR, and but even SLR shooters I'm sure would like it.
Cheers,
Colin