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He's absolutely worth it, especially if you have other figures to part-swap. Just keep in mind, there's 4 different versions out there. They all contain the base billy in his underwear, and whichever version you get has an alternate outfit.
The Halloween one has the pumpkin bloomers and cape. This one is usually the cheapest.
The Birthday version has leather and chains
The Christmas/New years version has his construction outfit.
The standard one instead comes with some weight accessories.