I have had the Iris system for about two months now. I am going on 2 weeks with ST.
The lowes system has some great features. I like that it has a keypad with the feel of a standard alarm system. I like that it chimes when I open and close doors. I like that the “dumb” part of the door sensors is very small. I like the price of add on devices. It uses pass codes and makes more sense when arming and disarming the alarm.
When I have accidentally set off my ST alarm I have been confused as to how to properly turn it off (I guess just push the button for siren in “things” and then change the mode to home). It just does not seem as straight forward.
Smart things is superior in a few aspects. It is much more customizable. Because of this it is also a more complex system. The Multi sensors sense vibration which the lowes don’t which works for window breakage and can be used for many other functions. Smart things customer service is much much more helpful.
The lowes system has been declining in reliability since I have had it. I often have devices that lose connectivity with Lowes. There is also delay in the notifications. I have had some come in hours later. Lowes also seems to go many months between updates that add devices or features.
Both systems use a cloud based system and are not fully functional without internet connection. Lowes charges $10 per month for many features that I feel should be included.
Neither of them is a perfect alarm system. At this point I prefer ST based on options and customization. I will likely return the Lowes since it seems to be less reliable each day (but I really do love the $25 motion sensors).
I think smart things is continually improving and adding compatibility with other devices. I look forward to continuing to add to my smart things setup.
Sorry if my reply is too repetitive or jumbled.
As a side note: If anyone knows how to add a “chime” to my system when opening doors with smart things that would be awesome. Maybe a short chirp or something from the siren?