I own an iPhone 3GS, and I haven't yet been affected by this bug. As I recall, the main issue last time was with repeat alarms, and I set mine manually every night.
That said, I do find it very disappointing that they haven't yet been able to iron out this problem. Yes, it might only be twice a year, but it tends to attract a lot of media attention and just makes the operating system look shoddy and poorly designed, when for most things it isn't. This should really be quite a basic thing for Apple to fix, and they should have done it by now.