I am trying to install Z wave at my house, and I now have 13 units installed, mainly wall switches. Whilst the quality of the units is good, and they look ok the range is pretty near to useless. Allowing for UK construction standards, useable range seems to be less than 15 feet. This means that I would need an awful lot of units, and I would very quickly surpass the 4 hop limit in my house.
I have spoken direct to customer support and they seem to say hard luck, there is little you can do, and talk of supplying a future product with an external antenna.
Has anyone got any history of this working in a realistic UK domestic environment?