I have the Samsung sensors currently and they seem to do well, but the price seems high and the battery life seems low. That said, are there other sensors that work as well or better that are easier on the wallet?
What specific features do you want in a device? The smartthings multi sensors are very unusual in having both an accelerometer and a contact sensor in one body. Most multi sensors instead combine a motion sensor with other features like light sensing or temperature sensing or even humidity sensing.
So it really depends on the use case you are looking for.