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The PacketShaper 4500 is a 2U rackmount box with two 10/100 Ethernet ports (you can add two expansion modules as well, for up to six ports). Packeteer's product offers the most granularity in setting policies, has an impressive classification engine, and has what we consider the best user interface. Although it has a command-line interface, most configuration is performed via a Web browser. And unlike all the other vendors, the browser interface is standard HTML, not a Java applet or Win32 application. 
We set a policy to give HTTP a minimum of 20 Kbps and a burst of 50 Kbps per connection on a series of small HTTP transfers, and got an average of 21 Kbps. If there isn't enough bandwidth to fit the guarantees, you can choose to refuse the traffic, squeeze it into whatever is available no matter how small, or in the case of Web traffic, redirect to an alternate URL. 
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