GaryK - 6:22 pm on Jan 27, 2009 (gmt 0)
Quite right, Owen. The user agent alone is only good for a starting point. It tells you this is the browser being reported. That's why I like bots that let me do a full round-trip DNS lookup on them to see if they're really from where they claim to be. But for most use, as in not bots, it's a great tool to help webmasters decide what sort of code to display. Then if the UA seems abusive you can go the extra mile and do the DNS lookup to see if it's for real.