It is a very good cam. I like it as the form and weight is very nice on my hand. It is fast and accurate. The 1V is of course better but I do not like to lug one heavy canon DLSR and a equally heavy 1V for shoot.
So the EOS 3 is for me. Performance is the same to me except the shutter sound is a bit loud. No use for the eye control for me though.
i was 'upgrading' from EOS 300 last year and really wanted to get the EOS 3. However, since I do not use professional lab to print my photos, I 'need' viewfinder coverage of 90%. I also enticipate I would wear glasses someday ans the EOS 3 does not have dipotric adjustment due to the fact that it had ECF and at the time of production, Canon have not found a way to put ECF and dipotric adjutment on the same body --- until the EOS 30.
So, I chose the 30 instead. The money I saved bought me a used Sigma 15-30mm