Most of the issues that we've seen with S2 are on the devices side. Unfortunately, not many manufacturers are making new firmware updates available to public, so the upcoming SDK updates will not fix these issues.
However, the multitude of bug fixes and enhancements that these SDK updates will bring, may significantly improve the overall Z-Wave experience. The positive feedback that we received from the beta users regarding the upcoming 7.17.1 update, is very encouraging, especially for the large and rather busy networks. The next release will allow optional update to version 7.17.1.
UPDATE: the optional Z-Wave firmware update to 7.17.1 for C-7 model hubs is now available [click here for the release notes of our recent update]
