It took me a long time to find a suitable Subversion client for the Mac. What really sold me initially was its look and feel. It's way more feature rich than Versions, but also has the same elegance and simplicity of a native Mac app. It also has a tremendously powerful built-in diff viewer and merging tool which has become essential when working with larger projects. Also, when working with large teams, being able to view diffs during a commit process is great since it gives you the ability to write details on specifically what you've changed; it's a huge time saver.
If you're on the fence about a SVN app, this is definitely the app to go for. Nothing else even comes close.
Ease of Use: 5
Look and Feel: 5
Overall Rating: 5/5