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Bought Energon Superion and FP upgrade off ebay. Also bought the DMY upgrade for the FP upgrade but that's still on its way from The Orient.
The combined chest untabs way too easily and the shins are too wide or the combiner pegs/ports are too close to each other so it's impossible to get it in a neutral pose. The hip ratchets also have too much give so the combined mode does the splits too readily. Besides the chest though, it's actually surprisingly solid. I expected the legs to be a floppy mess but it's the most solid parts of the toy. The ball joints and some other joints are a bit loose due to it being a 2005 toy, but I can fix that easily. I'd still recommend it as an amusing combiner and as a piece of 3P history for under $80.
Oh, one more thing. I got two Energon Storm Jets/Silverbolts and both of them had miss-assembled knees. One had two right knees and the other had the knees swapped. I don't know if this is a common thing with the Energon Storm Jet/Silverbolt toy. It won't affect transformation or combined mode, but still something to be on the look out for.