I don't know who keeps saying this but I'll say this - they simply don't know what they're talking about. 10 years ago yes, zwave was a mess.
Now with mature 700 series devices and an open protocol, zwave is exceptional. If someone is ranting the greatness of Lutron vs. zwave they're a dealer or have never tried new zwave.
If someone wants to chirp about how great RA2 is or how super great RA3 is, don't until you run a 700 series zwave network for a while.