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).
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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 Dedicated media controls
On its top right corner, this keyboard has 5 media control keys and a volume roller. These keys are round, making it easy to quickly tell them apart from the rest of the keys.
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).
Con Slight metallic ring when keys bottom out
You may notice a slight metallic ring when bottoming out individual keys. It's hardly noticeable when typing text or gaming, but, on occasion, when pressing keys individually, it's perceptible.
Con No switch choice
Romer-G switches are the only available option for the G810. It could be interesting to have the option of getting this keyboard with Cherry MX switches, which many find more satisfying to use that the Romer-Gs.