It has a lot of features and customization options.
Lanuage translation/Internationalization is good. Good use of Google Services.
Logon by FacebookId/MySpaceId etc.
It might be usable out of the box but this does not mean it can scale up (poor architure - they could look at Design Pattern Framework 3.5 C#: Patterns In Action for guidence).
Having the Castle.Windsor does not mean it uses best practise, esp if you use a bit of LINQ there and a bit of AR there and whatever else takes your fancy. That is, there is no technical architecture
When you get the sourcecode (you should) you will see that there is still work to be done; that is you use it as a starting point for your own version.
If you run ReSharper over the code you will see there are 338 files with coding errors, this excludes the HTML W3C issues. The source codes does not come with the required AjaxControlToolkit.dll so which one do you use? The UI code for this site is used on many dating sites - so they all look the same.
Try http://www.aspnetdating.com/DatingSiteLite.zip before you buy it.
There are a lot worse - but then I paid for this software!