Hi @Austinhead @Sundry , i'm running a pair of EX2700's
Hardware Version: EX2700
Firmware Version: V18.104.22.168
Mine (touch wood) are working fine .. though they seem to boot faster than the KS does, so if there has been a power failure , you do sometimes need to reboot them AFTER the KS has initialized and settled down to get them to connect.
Also , if you reboot the KS , they don't seem to auto reconnect , and again need a reboot , themselves, afterwards.
BUT having said that , they do indeed work, and the devices that talk through them do indeed show up as their own (rebranded) MAC.
(the two with _EXTR are devices coming in though an N300, positioned at rear of my property.)