I've been working with SP1 for just over a week now. Yes it does fix a few things but there are still a number of ongoing problems and it also introduces some new issues also:
1. An inherent problem with policy settings not working. You will need to check all policy settings such as the security settings and password settings.
2. Blackberry Manager MMC crashes when you select User Properties - There is a workaround for this.
3. Calendar scheduling problems.
4. Spurrious error messages in Event Viewer.
Should I go on.....?