Hey.
I first bought the 203FE, because i wanted integrated metering, the 1/2000 shutter speed, and the ability to use faster FE lenses. I have a Sekonic 358 meter, but wanted to use the 203 on travels, photographing people in countries in which i didn't want to have to try to explain that i needed the subject to stand still while i pointed a second odd-looking gadget in his face before using the camera.... I only sold the 203 because i had some financial issues at one time, a few years ago. Bought the 503 shortly thereafter, but never got over the need/want of the 203, so i re-bought it when the opportunity presented itself. The 503CW is quite nice. It's comforting to not have electronics in it, but i never ended up using it 'in the field.'
The 203's meter is very accurate. You know everything else about it, i assume. What else is there to say? I haven't had any issues with reliability aside from one curious problem late last year. I took it to South America, and when i went out to photograph a man i found on the street, i realized the meter readings were backwards. I was using the waist level finder, and the LCD's characters were all reversed. I managed to read the data, and get good exposures, but i was really perplexed. I couldn't remember if it had always been that way, and was only right-reading when i attached a prism.... Turned out i wasn't crazy after all, and there's a small switch that changes the LCD forward to backward, based on whether the WL or prism is attached. It was a simple fix for Hasselblad, but it did worry me for the extent of my trip.
With the 203, you get access to some nice lenses. I had the storied 110/2FE, but never really liked it. It's nice to view/focus through, but i don't like the bokeh, contrary to just about everyone else who writes about it. Instead, i got the 150FE Sonnar. I had the 120 MakroPlanar CFE, and liked it, but now i just use the 150 with a short extension tube. Never tried anything wider than the 80CFE and 80FE.
If you have any specific questions, you can send me a personal message.