Here's a comparison of ways you can read your feeds from google reader on your non-touch s60 phone. The focus of this comparison isn't to highlight the features of each, rather its to compare one thing: how it displays the complete feed. The complete feed is simply how it's displayed on the desktop with the exclusion of videos of course. The more complete the feed is, the more a desktop experience you get on your mobile. Well, just the feed at least.
First off, here's the actual feed from the desktop version

Now to the mobile solutions:

From left to right:
Opera Mobile (set to mobile view mode)
Opera Mini (set to mobile view mode)
UCWeb (set to adaptive mode)
The mobile gReader site is as good as it gets. It gives you as complete a feed as you can get really. The article is there, images, embedded links, html styling & formating, etc. Though each browser has its issues. Opera Mobile has image quality issues & image stretching issues (not quite apparant in the screenshot, but its there). Opera Mini has image quality issues, limits with images displayed and can't resize the image to page width even in mobile view. UCWeb doesn't align text, doesn't space between paragraphs & gets confuse a bit with html styling on occasions.
http://www.google.com/reader/i

This is the iphone's version of gReader on Opera Mobile. It displays almost identical to the mobile gReader site. Again there are minor issues. Images are resized but not fitted to page width. As a result, they look a bit smaller. On occasions, especially with the s60 browser, text and images tend to offset to the right of the page requiring horizontal scrolling. Not a big fan of that.
MojosMobile gReader

This is how a feed looks like on Mojosmobile's gReader application. Not so great isn't it. You get small size images, plain text, paragraph breaks with no spacing and that's about it really. The article is completely stripped down from it's original html formating. What's worst is the app doesn't use the entire page width to display the article because of those oddball icons on the right. I am not impressed, especially considering its a paid app.
Gravity gReader

This is how a feed looks like in the beta gReader in Gravity. Again not much as in MojosMobile own app. Plain text only and paragrah spacing. Still no images yet. Granted, Gravity's implementation is very beta so you can't criticize it too much. It just hasn't been developed in full yet.
The point is this, if you're creating a gReader application or solution for mobile & you're turning it into a paid application, you better make sure you develop one that meets or exceeds the free alternatives. Priority number one should be the feeds themselves and displaying them correctly. That should be the the core of the app. Build everything else around that. Mojosmobile app, to me, wasn't designed that way. The opposite in fact. Lots of features, but feeds look horrible.
Note that this post is strictly about how the feeds are displayed and nothing else. Extra features, usability, naviagation, etc are not mentioned.
What do I use as my gReader solution on mobile? I perfer the mobile gReader site on UCWeb browser. Why exactly? Maybe in a future post? I'm tired. This was a long post.
Here's a list of issues I've encountered so far after 24 hours with the Nokia N86. Note that I'm still on the initial firmware until v20 gets release for the US variant:
The wobbly slider is getting pretty annoying. I may return it back to Amazon on Monday and try to exchange it.