Here’s a teardown for the V2 with pictures.
Teardown Tuesday: Samsung’s SmartThings Smart Home Hub and IoT Water Leak...
In this teardown, we open up Samsung's SmartThings Hub and a Water Leak Sensor to see what we can find.
Meanwhile, since this topic has popped up to the top again, as of this writing (February 2019) The IKEA Tradfri plug-in pocket socket, available in many different countries including the US and the UK, seems to be a good solid zigbee repeater which also works well with the Xioami sensors.
$9.99 in the US, £9.95 in the UK. This is just a basic on/off switch, no energy monitoring, but useful at this price.
The Tradfri bulbs and this outlet work well with smartthings. The handheld buttons and remotes have only partial integration at this time.
UK Link:
TRÅDFRI, Smart Wireless control outlet
TRÅDFRI, Smart Wireless control outlet. Now it's really easy for anyone to use smart products. The outlet allows you to connect any lamp, coffee maker or another household appliance to the control outlet and control it from a distance.
US Link:
https://m2.ikea.com/us/en/p/tradfri-wireless-control-outlet-30356169/
There were some initial bad reviews because people expected it to work with HomeKit, like the smart bulbs do, and it does not at this time. But judged just as a simple zigbee device, it seems fine.