Nice bargain. GoControl kit 2 contact sensors, 1 motion sensor for $44.

I tried this GoControl Kit with SmartThings and it worked just fine. If you need the siren you need the other kit with 2 more contact sensors and 1 more motion sensor for additional $50. By comparison, SmartThings contact sensor by itself sells for $40. But it is an all-in-one sensor that can detect vibration, orientation and angle (tilt), temperature and when things open or close if you need that for example the garage door or to sense end of cycle of Laundry.

This kit is also supposed to work with Wink hub but I never tried that myself.

So, if you are still debating, hope this helps.