I've just come across this thread. I bought the PC I 8x25 in May this year and have been as delighted with them as Keith was disappointed. They're everything praiseworthy that's been said about them and more. I had come to the same conclusion as you, Keith, that I needed large-diameter eye-cups and preferably a large exit pupil, but the Olympus has proved me wrong. Maybe it's that the eye relief is just about right for me, but I can look through them for ages without strain. As an added bonus, the claimed close focus of 2.5m is actually 1.5m, which is really useful for me, because I look at insects and flowers as well as birds. In fact I bought a Pentax Papilio for that purpose, but never got on with it. There was no setting, glasses on or off, eye-cups in or out, where I felt comfortable with it. I often take the Olympus along in preference to my 8x42 porros. The 8x42s outresolve them, but not by much - and the lightness, neatness, excellent close-focus and good eye relief mean that these are the closest thing to a good all-rounder that I have.
Michael