I looked at the Knock. The idea of tapping a sequence to turn something on for $130(retail)? Alexa is way more useful and not much more. I could see a few use cased for it though, like front door. With the granite example, I bet the range is not super far with vibration detection.
The Pop is interesting, but again price point is a little high. I would love to see small buttons that you can mount under cabinet/tables for around $10. Minimotes can be had for less than $15
The Beddi (with my smartApp integration with ST) is actually turning out into a sweet bedside replacement for my minimotes. Need to figure out what to do with them.