I've met a couple of people who've worked there, one was quite bitchy about working conditions but you could get that at any company.

About 2000-2001 the company I was working for tried to buy a license to use their search software on our internal documents. It all fell apart for various reasons, including a price tag that was well in to six figures (Sterling) may even have been almost £1,000,000 my memory fails me as it wasn't going to be a good fit for our project anyway (long story.)

The tech they had then was very impressive when demoed, and I've heard even more amazing things about it since, but again, all in demos. I've not used the software direct, partly because I haven't worked for companies that could afford to use it.