Just a few things to add:
1) I asked for feedback on if people thought the build was stable earlier in this thread - all the feedback I got was positive (so it's more helpful to get your thoughts in sooner rather than later)
2) I had a brief review of the bug tracker to help me decide if the build was stable and there was nothing serious on it - so if you find problems submit them as bugs
3) You don't have to use this build if you are still experiencing problems - feel free to go back to 0.98.9 (since any wise person using beta software will keep backups!)