UPDATE: In January 2016, Logitech released the Proteus Spectrum, an updated version of the Proteus Core with full 16.8-million-color RGB backlighting. Aside from the illumination and a few blue highlights on the mouse itself, the Proteus Spectrum is exactly the same as its Core predecessor, right down to the G502 model number and the price. I don’t have a particular recommendation between the two, since they’re nearly identical. For those who own other Logitech peripherals, though, it’s worth noting that the Proteus Spectrum can sync with the company’s RGB gaming products, such as the Orion Spark keyboard and the Atlas Spectrum headset.
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