For the past month or so I've used it nearly every day. It does have *serious* weaknesses. But I still use it because it gives me clues that are good enough for me to make progress in trying to figure something out.

You can't just plug text into it and expect to get a correct translation out. It nearly never does that. But, as I say, as a research tool (combined with other web resources) I find it pretty indispensable.