Awesome! I already have an Echo (just set it up three days ago), and I'm in the final stages of getting rgraciano's / jishi's Sonos integration working with it. It's way cool to be able to control music from the Echo, and I can only imagine how much better controlling lights will be once I can speak the commands instead of walking to a switch or wading through menus on an iPhone. There are a couple of other community written apps out there for getting Echo to control Z-Wave, but I like the concept of a commercial device with built-in direct support, so hearing that it works well and still allows the VRCOP to control lights is excellent news.
You mentioned replication from the ST to VRCOP. All of my configuration is currently in my VRCOP, so what I really need is the ability to go from VRCOP to ST. Is that supported?
Also, I'm a little leery about turning on polling in the ST. I'm already having a strange problem with my Vizia RF+ devices sometimes missing Z-Wave commands or taking a long time to respond to them. Polling might exacerbate that problem if it floods the Z-Wave mesh network with new traffic. Can you control how often ST polls the switches? I have 50+ Vizia RF+ devices, so a complete system poll could generate significant mesh traffic.
BTW, have you used ST with Sonos? From the posts I've read, the ST is extremely weak in this area. I'm fine with the community developed solution that I currently have, but I'm curious to know your thoughts on the ST implementation. Until Sonos releases their API, everything out there seems to be a reverse engineered solution, with the expected glitches. It's truly incredible that Sonos hasn't done an API until now. That seems like a really major oversight on their part.