The G810 Orion Spectrum is basically the same as the G910 Orion Spark, except it has a more professional looking body (there are no dedicated macro keys, the key tops have a regular shape, and there is no included wrist-wrest).
Pro Fully customizable RGB lighting
The Romer-G key switches used on this keyboard have little light-bleed, and the Logitech Gaming software lets you light up individual keys with any color. The software can also detect games running, and provide pre-set lighting profiles for each of them.
Pro Good in-house made switches
This Logitech keyboard uses in-house developed Romer-G switch technology, which is designed with gamers in mind. The keys actuate at just 1.5 mm with a force of 45g, giving them a very responsive feel. They're also built around the RGB lighting, and therefore suffer from little lightbleeding. Another benefit is the long durability of these switches, which have a lifespan rated at 70 million keystrokes (higher than the typical 50-60 million rate of other key switches).