NRF52840-DK EVAL Board for NRF52840 nRF52840 - Transceiver; 802.15.4 (Thread, Zigbee®), ANT, Bluetooth® 5.x (BLE) 2.4GHz Evaluation Board vs Realforce Topre R4 Full Size Wireless Keyboard (Black, Topre Silent 30g)
Side-by-side comparison based on Reddit community data

#9 in Mechanical Keyboards
Nordic Semiconductor
NRF52840-DK EVAL Board for NRF52840 nRF52840 - Transceiver; 802.15.4 (Thread, Zigbee®), ANT, Bluetooth® 5.x (BLE) 2.4GHz Evaluation Board
$97.60
100/100Excellent
100% positive0% neutral0% negative
“use an NRF52840 Bluetooth with ZMK as the MCU.”

#4 in Mechanical Keyboards
Realforce
Realforce Topre R4 Full Size Wireless Keyboard (Black, Topre Silent 30g)
$275.00
100/100Excellent
100% positive0% neutral0% negative
Pros
- +Preferred over many other boards
- +Reliable (implied by 'always end up going back')
“I am a big MK nerd and after owning a stupud amount of boards, I always end up going back to my Topre boards. Have you considered Realforce?”