I ordered my Corsair K63 with the lapboard combo to use for work as I wanted a wireless mechanical keyboard with MX Cherrys. The only competitor would be the logitech G613 and they use their own in-house keys which do not feel as nice.
A few notes after using this for more than a month.
1. Battery life could be better but if you turn off the LED's it is "decent".
2. Feedback and typing feel is not bad - satisfied with the MX Cherry REDS but probably would have preferred BLUES or BROWNS. It is unfortunate that these are not able to be hot swapped.
3. Also would have liked the ability to switch between multiple blue-tooth devices. You can only switch between WiFi adapter and blue-tooth.
4. If you wish to pair a new blue-tooth device, you will have to re-pair every time even if you have paired the device in the past. So you have to unpair from device 1, re-pair a new connection to device 2. Rinse and repeat everytime you wish to change device.