I have been running .610 for two days without any issues. The memory management is ok, similar to .509 for me. Wifi works well and the call quality is good, so far so good. The strange thing for me was; after downloading and installing .610 to my computer I ran DM to do a back-up before installing the new OS. When my DM starts up it always looks for updates and found .610 and loaded like any other update. It is the first time I did not have to delete the Vendor file or do a browser fix. Strange, but I'll take it.
It's better to be lucky than good. You can learn to be good, you can't learn to be lucky.