@Riley_S sorry boss, i wasnt watching this one for replies... 

what i really like: the ability to set up multiple zones on one device to activate and deactivate things. for example, i have one that covers the open area that oncludes the living / dining / entry of the house. if someone sits on the couch itll send a message to the LR control tablet offering to turn on the audio video setup. if the light sensor reads less than 25 lux itll automatically turn on lights when entering a zone and turn them off when exiting the zone. the zones need to be able to overlap. this has proven far more important than i wouold have ever guessed. and of course the fact that its a MM wave and not a PIR means that things dont turn off every 10 minutes, and i dont have to wait 10 minutes for things to turn off when i do leave. the range is pretty great. about 46 feet. and im still figuring out new ways to trigger new automations.

what i do not like: cord required. i like the option  of corded operation. but i dont want to have to have a cord. it would be great to have a battery powered option, even if the battery required is a CR123 or even rechargable. but id like to have both options, since it really doesnt add much cost to a battery powered device to include a usb c plug also. neither do i like the awkward leg thing that aqara included on the FP2. i understand why they did what they did, but it really just makes the device more difficult to use. some sort of a ball joint type of mount maybe? definitely maintain the magnetic option and the metal plate. thats awesome and becoming fairly common. lastly, the zone builder / editer has what i would call some silly shortcomings. i can mark an exit, but when the sensor sees me leave thru a marked exit, it doesnt mark the zone as clear. i have to create another zone for that as i pass out of the doorway. this is an issue because there are only 6 zones per device and i was using half of them to mark the exits. until i figured out that i could just use one zone and mark all the exits. still, the exits should do that without taking up a zone in my opinion. otherwise whats the point?

Im sure theres more, but those will suffice to get started for now. Thanks for reading my novel.

  @Riley_S yeah, i definitely understand the difference in how they operate and the ability to enter power save / sleep mode for PIR devices. And i have been trying to measure the actual power draw of the unit(s) i currently have, and have as yet been unsuccessful because i dont want to resort to destructive testing, and i dont seem to have a device which will only supply and or measure the power which is required by the unit. since it requires a USB blister of some sort, and they all draw more than the device is actually using. so i dont get anything near an accurate gague of its consumption. i have however had battery powered active scanning PIR / microwave devices in my home which use 2 x CR123a batteries, and those have lasted as long as 5 years. Those are what im looking to replace, btw. i wouldnt necessarily expect that the same batteries would last 5 years in this sort of device, but id really like to know what the actual draw is for a device like we are discussing, and what the battery requirements would actually be.