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Yes, they're great and definitely worth getting, our sash windows used to get drenched and black mould would at the bottom part of the sash where the wood would get wet over time. This completely disappeared after using the vaccum on them. Takes about 10 seconds to do a window, great for using on the walls after a shower too.
Even if you need a dehumidifier it'll work much better if you're getting rid of extra water that'll just end up in the air first.
Has anyone got a Karcher window vac? Getting terrible condensation on windows just now. Guess I really need to bite the bullet and get a dehumidifier