I just received the Deco XE75.  I was impressed on how easy it was to setup and now administer.  However, I am very dissapointed that there isn't a way to set the channel for the radios.   The Optimizer continually sets my 2.4GHz radio to channel 2 which is an overlapping channel.  So far my 2.4GHz clients are associating and operating well, but if there are problems I will need to consider returning it.  I will be keeping my Orbi system just in case.