I've tried a few of their door and window sensors. The z wave plus version have worked well, however, I get many false positives on the regular zwave devices and they're inconsistent - for example, the child devices on two supposedly identical door/windows sensors are different.
I've not tried any of their appliance or dimmer modules.
I have several of their zwave plus recessed door/windows sensors. I actual used one to replace a failed aeon labs model. It's been several months and it's working fine, however, I did notice that the open/close and tamper child devices were reversed and have to monitor the tamper instead of open/close, however, this could just be due to how HomeSeer sees the device and not actually the devices fault.