It's a great option, but you pay a premium for tons of features you may not need.
CAN$50/ea. for the modules + case + power supply.
Everything XBee
Made a Set Of XBee3's
I think that's an XBee2 kit you linked to, probably want to go with an XBee3.
Or, do what lots of people do, just buy both Tradfri and XBee. 
