My company has a non-disparagement policy (just something you can get fired for, not sued), but when people ask me what it's like to work there, I usually tell them, but with the explicit caveat that the non disparagement policy is in place, so my (or any current employee's) expressed opinion on the matter can't be trusted. Kind of a shame though because (and of course you can't trust me on this), I actually do quite like it there.