Well, my warranty has expired, so I wont use beta firmware without having a significant reason. Just what does this beta firmware bring to the party that the official release doesn't have? If all it does is update some issues (which I have none) and doesn't add any more usability, I will pass.
As for anyone having dropped connections, I suggest replacing the router, as I have no problems with my 655 what so ever since purchase and setup.
Also, XP and Vista cannot share printers for anyone having printer issues. Reason is, Vista doesn't allow XP to join the the workgrop or circle as it may be.