BoltReader also has a plain UI with muted colors and a grayscale look in various places. Its sync routine is divided into two parts: feeds and images. The syncing process is fairly slow, but you can view folders that are already updated while syncing is in progress.
Byline was the very first native RSS app I tried on the iPhone. It is among the most stable of all iPhone RSS apps—it very rarely crashes or freezes up—and it usually does what it promises it will do. It offers full two-way sync with Google Reader, allowing you to star and share items, e-mail items, and create and share notes. It also has landscape mode, an inline browser to view full posts, and an offline reading capability.
Despite the fact that Web apps are viewed by some as the ugly stepchild of the iPhone, my most-used app is Google Reader. It’s like Marvelous Marvin Hagler—the fantastic, undisputed middleweight boxing champion back in the 1980s—because it’s so much better than its rivals. Part of the reason it’s such a great app is that Google has regularly and lovingly tweaked it, adding niceties that make it easier to use and features that bring it ever closer to the capabilities of its desktop counterpart.