Just jotting down my experience with the Monoprice window sensors in the hope that it might help someone.
Bought a few of these sensors for about $30 each. Pairing the first sensor was easy and quick. Just add a “Aeon door/window sensor”, but then change the device type to a “Z-Wave Door/Window Sensor” at ide.smartthings.com. I further changed the device type to a custom device based on @florianz’s code here to see if I can get battery stats, but it did not help (the open/close detection works well though). (@florianz, How can I get battery stats?)
Second sensor I tried to pair was very uncooperative. Tried at least 10-20 times to pair, without any success. In the end, I was seeing the LED glow bright red continuously, which indicated it was already paired (but hub was not seeing the device). It was then I re-read the manual which listed the steps to exclude/include the device. Then went to ide.smartthings.com and forced the hub to exclusion mode, held the program switch on the sensor a couple of seconds to reset it. Tried to pair again a few times after that and it worked.
I also purchased a few motion sensors, will post back here if I face any issues.