Also interesting to note is that Chris Pirillo switched back to full-text several days after the post you linked to (http://chris.pirillo.com/blog/_archives/2005/5/26/886557.html).

1/ Wait until you have ads on your site, and you’ll even split the *POSTS* on multiple pages, as most online magazines are doing nowadays.

2/ I don’t want to read posts in an aggregator. I need to feel the entire site, and be able to switch easily to any linked site, so that it makes an entire conversation or discovery path on its own. That needs to happen outside of the aggregator, that I view as the source for these conversations or discovery paths… a source I’m going back to on a high frequency, so that I’d better leave it open in its own tab, and open new tabs for visiting the sites anyway.

3/ I love when a brief entry caughts my attention, and that I’m left to click to discover even more richness. RSS reading is a treasure hunt, don’t give the gold chest too early. If you give it to me in my aggregator, it does not even look like any gold – it’s just all grey.

4/ So is a post text all that you’re looking for? Where is the conversation happening then? Well, forget about this comment if you don’t care
I don’t mean that full-text feeds are preventing from reading or using comments, but that if you want full-text in your aggregator in order to appreciate a post’s value to you, then you should not forget the comments either. My opinion is that a small catching paragraph is fine for deciding or not to “take the risk” to go further. The remaining part is the adventure.

However, your argument that full-text feeds “strengthen the brand” isn’t necessarily true; the texts may be seen in a different light when surrounded by the context of other texts, coloring and images, and related links that appear on the site.

The sites I won’t read are those that only have a headline that’s neither attention grabbing or informative.