Hi Philip,
No known problems on the latest build (DP7). Obviously I don't have any long term figures, but nothing wrong spotted over a few runs checking various things. We won't know for sure until it ships, but for now it looks good.
It is true the Silicon Labs installer isn't signed (which is shameful really), so it has to be control-clicked to open and run the installer package, but once it's installed it loads fine (at least on my developer machine).
Cheers,
Stu.