[dqybh]

If you're afraid of Google bombing, the redirect is not even necessary, just make sure the <link rel=canonical> tag contains the correct URL.

[eli]

I prefer redirects because if someone edits a URL to look like /1234/offensive-phrase-here/ and shares the link I don't want it to appear that we choose that phrase as a slug.

[slig]

That's a great suggestion, thanks!