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I like them. My favourite, appearance-wise, is Tornadus's Therian forme, with Thundurus's Therian forme being a close second. For actually using them, I prefer Thundurus-T slightly over Tornadus-T.
Using both Thundurus and Tornadus in doubles can be pretty fun, especially in rain.
>Tornadus-T with decent bulk, amazing speed, and regenerator, plus Hurricane and Tailwind
>Thundurus-T with Nasty Plot, giving 100X accuracy +2 Thunder at 2x speed off of 145 base SpA
Not the most competitively viable team, but very fun.