Google Search Appliance User Experience Guide - Manual (Page 6)

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Security can be managed at the application level by allowing the application to determine the
collections and front ends a user is able to see.
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Look and feel can be maintained within host site templates.
Disadvantages
However, using the application presentation layer has the following disadvantages:
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The deployment architecture is more complicated because of the additional hardware required.
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It is more challenging to manage document-level security because credentials need to be
captured at the application layer and forwarded to the search appliance.
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Incorporation of some core features may require more effort to bring into the UI. For example,
enabling dynamic result clusters with the search appliance presentation layer is as simple as
clicking a checkbox in the Admin Console. To enable this feature with an application presentation
layer requires manual implementation in your application. The following features are not currently
optimised to be deployed off box (via a separate application server):
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Document Preview
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User Results
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Expert Search
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Dynamic Result Clusters
For information about search results in XML, see
XML Output in the Search Protocol Reference .