Kazaa is on the oldest free P2P file-sharing applications and despite raspberries from many critics still retains widespread appeal. With one of the largest user bases installed, Kazaa is considered by many users to be superior to other file sharing programs because of its wide file selection and fast transfer speeds. The program uses a "participation level" system to reward participants who share a lot of material with fast downloads. The number of users connected to the Kazaa.com network at any given time fluctuates between 1 and 5 million users, the average usually lying in the number of 3 million users approximately. There are over 1.5 billion files on the network, with about 1,000 downloads every minute.

One of the key benefits of using Kazaa is the application's extensive search capabilities. For instance, you can you can 'Search More' up to five times. This means you can access up to 1,000 results per search. Each 'Search More' displays up to an additional 200 search results score. You can also use Search Agent when you are in search of a file to perform repeated queries every 30 minutes, over a 24- hour period and can use up to 24 simultaneous searches. There's also a feature called "Multiple" search result tabs: Each search you perform is displayed in a new window. This means that your search results won't be overwritten by each and every new search you perform. Further, you can also use "Quick" and "Advance" search tabs to obtain more complete and fast searches. Lastly, you can also search the Web. Other important benefits of Kazaa.com include a customizable toolbar, the ability to preview downloads and an opportunity to promote your blog.

Despite the many positive features that Kazaa.com has, the application has its detractors. Although there is no spyware, there is adware that can be quite annoying with all its privacy and security implications. Moreover, the "participation level" system leads to subversion from the bulk of the unauthorized clients, leaving the legitimate third-party ones toiling away. In addition, if one wishes to uninstall the Kazaa they will have to go to the Windows control panel to remove the software. Users have also complained of sluggish speeds with a frustrating successful download rate (often downloads are cancelled, pending or searching for users, and seem to never get completed), while your computer gets poisoned with adware. The end result is that you can't download files while suing other programs simultaneously (especially the internet). While Kazaa.com was a pioneer in the P2P arena, many believe other programs have surpassed it and that you would be better served going elsewhere.