Have you seen the Crossover Transformers toys?

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I have been collecting Transformers toys for a few months now and recently seen "Crossover" toys, which are Transformers that Turn into characters from Marvel comics or the Star Wars Universe. I have got hold of 3 of the Marvel ones (Spider-Man, Venom and Captain America) and some of them look really good and I like the ones I have been able to get hold of so far. I currently have none of the Star Wars ones, although the ones I have seen look pretty good. So what do you think of them?