Like Steve Maine, I've recently switched to RSS Bandit from SharpReader as my news aggregator of choice.  My main issues with SharpReader were:

• It used up way too much memory (300,000 K vs . 24,000 K).
• It took too long to load, the toast notifications used to hang my machine (I know I could turn them off but somehow I never got around to doing it).
• No ability to flag messages for follow up.  Being time-challenged of late I really wanted to mark records that I could post on later but couldn't (except by using the 'lock' and hunting for it later).
• No way of counting how many feeds I subscribed to (not really important, but I wanted to know - turns out it's 280).
• It ate some posts once.  Luke fixed this one pretty quick, but I find it hard to get over a data loss.

I'd tried RSS Bandit in the past but didn't think much of it.  However, now it provides a solution to most of the above problems.  It's fast, very quick to load, has great flagging and searching support and I really like the ability to use my own style sheet to view the posts (I wanted to try Newsgator with Lookout inside Outlook, but I had to install them a few times so that they'd play nice together, and then I couldn't find an easy way to choose my own reading font).  Matt Berther comments on Steve's post mentioned JetBrains (the people behind IntelliJ and ReSharper) have an Outlook plugin, OmniaMea that supports blog feeds as well as NNTP, so maybe this is my ideal.

Some things that I miss from SharpReader in RSS Bandit:

• Like Steve, I don't like the default alphabetical ordering.
• The arrow keys to move up and down between posts.
• The space bar takes me to the earliest unread message, rather than the most recent unread message.
• A strange setting where the font is always +0.25 bigger than I asked for.
• I preffered SharpReader's ability to open the browser in multiple new windows to a docked browser (maybe there's a config setting I'm yet to find).

I'm an archive kind of a guy so I'd love to find some tool to convert my SharpReader archive to RSS Bandit.