The Good:

• Handsome pop-up window to browse in a Cover Flow like view.
• Minimal UI clutter. Can run in the background without a dock or a menu item.
• Keyboard controls for the standard next/play/pause/etc… Can also rate with the keyboard. Big deal to me.
• Last.fm integration. Just scrobbing but their "upgrade" Everplay goes a lot further in this direction.

The Bad:

• Hoards memory like there's no tomorrow. Often mirrors iTunes memory usage. I wouldn't mind this so much but this leads me to the next point.
• After running for a while, keyboard combos don't immediately register. If you're eating that much RAM, could you make good use of it and be responsive? I'm talking 5-7 second delays while the system is pretty much idle.
• Quitting iTunes will randomly confuse Cover Stream and try to relaunch iTunes.
• Will often forget to "Scrob" to last.fm. Must relaunch to remind it.
• Column position for album tracks not remembered. It's a beautiful app but that last 10% isn't there.

The Ugly:

• This is the end of the line. Except for any glaring errors preventing it from running, all future developments will go into Everplay. This is according to the Snarbsoft forums.
• "Free upgrades for life!" is the claim made on the product homepage. Life? End of life? What?
• The features in Everplay was intended to be in Cover Stream but it diverged so badly that their customers objected. Surprising? I don't think so. Now they are split into two products.
• You can upgrade at a discount. I have no problems with this but Snarbsoft should be clear about what you're buying. I shouldn't have to dig into their forums to find out that Cover Stream has effectively reached EOL.

Overall it's a good product but the creators lack clear direction and I believe it has hurt them since there was a lot of potential for Cover Stream.