I have spent the last week trying out both the Incredikernel HWA Beta 1 and the latest Tiamat ICS HWA kernel. I have found that overall, the Tiamat kernel has smoother scrolling on hardware-drawn menus (most noticeably on the OI File Manager, but noticable on the Settings menu as well). When I am running Incredikernel, these menus judder noticeably while scrolling. However, I also find that Tiamat is incredibly unstable. Even running at stock speeds and stock voltages, I get app crashes, hot starts, and reboots. With Incredikernel, I can both overclock and significantly undervolt and I never get any crashes or reboots.
What are your experiences if you have tried the different kernels? Can you see the juddery scrolling, and do you get crashes/reboots?