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Our company was using the Google Search Appliance for years, but recently switched to Coveo Search.

http://www.coveo.com/en

For an enterprise with mixed Windows and UNIX servers and SharePoint there better options than Google. For web based data, Google does great. For mixed media that has varying security constraints we found Google lacking.

We used FAST Search.

An interesting anecdote about the Google Search Appliance, a bunch of companies complained about them in the beginning because they conflated "search intranet" with "search file shares" and of course Page Rank is not as effective on file shares as it is on web based systems.

I used to work at FAST, but left soon after they were acquired by Microsoft. How did you use it?

I have set up a website where you can try out several enterprise search engines on the same data. Have a look at http://www.opentestsearch.com/ .

There is also a review of each one.

Very cool service, thanks for sharing.

We use swiftype. Can't compare with GSS because never actually used GSS, but swiftype seems to have better APIs, responsive support staff and good looking UI out of the box for end users. And we are quite happy with it.