Hi
I am sure that it must be much better and updated than VRCS4. The problem is I live in Brazil and imports fees things here is very expensive . It coust for you 39usd, but for me buy and ships here I will pay almost 160usd each.
There is another way, harobinson has been made a great job and developed a EDGE DRIVER for VRCS4. It is working fine for VRCS4-MRZ now too.
You and who needs it can find this EDGE DRIVER here [ST EDGE] SmartThings Edge Driver for Leviton VRCS4-M0Z and VRCS4-MRZ (Beta)
As soon as possible I will update my devices, but for now I have to keep using them.