I used to work for Isilon - Still well promoted, but more than half the team I worked with has left in disgust since the acquisition. I made out like a bandit with my stock, though :)
I used to really like them, but when I recently tried restoring a folder after accidental deletion, I found files corrupted and misnamed. Nothing worse than a backup company that doesn't properly backup your files. Real shame, they used to be great.