I had to replace the pad three months after I bought the MPS-850 kit. The hits stopped registering. What is more, few weeks after the replacement arrived, another one got faulty for the same reason. Get ready that if you use it as snare it wont last long after intensive use.
Thomann was great replacing the faulty one but I don't feel pad lasting 2-3 months is acceptable. But again, you get what you pay for.