The only problem with Tiger A8xx builds is that the CoreVideo/CoreImage libraries are taking time to update for existing video hardware (which is expected, and may make up part of the extended development time decision). For example, older hardware which isn't CoreVideo supported (specifically, the Rage 128 Pro chipsets) can't render transparency onto video, and video is slower than it was in 10.0.4. At the very least, it would be good to see speed of video on things like the Pismo at least stay the same compared to 10.3 when compositing/filters is not happening with the video...
That and a minor bug in Mail that breaks support for IMAP servers with testing SSL certificates.