IMHO it is not important to pay attention to user agents at all.
1)Absolutely everyone who uses "teleporting" soft is able and does impersonate their kind of "browser" as "IE" or alike.
2)Surfers from leeching sources are using usual browser soft like IE or Opera and sequently not differ in this way from others.
3)Many new SEs started today, so you either have to include them all in your allowed browsers list or will loose their traffic.
4)Either black list or allowable list is larger is a kind of question.
I think it is waste of time to pay attention on user browser. Though you can exclude "TELEPORT" and very few other "defaults".
Thanks.
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