Since nothing is perfect, here's a list of the known issues with the all the current releases:

• FIXED: doesn't allow keymap selection at boot (can be done later with loadkeys )
• doesn't have splashscreen/progress bar at boot, no framebuffer decorations
• using provided stage3 to install forces you to unmask latest gcc, glibc and linux-headers in /etc/portage/package.keywords right after install to prevent downgrades
• if you want to migrate to reiser4 on root partition, you have to edit /etc/init.d/checkroot to avoid fsck segfaults (file available through server); otherwise, you can update e2fsprogs and unmask latest reiser4-progs, that provides compatibility with e2fsprogs (can be "normally" fixed using baselayout-2 + reiser4progs-1.0.6-r2)
• Unable-to-include drivers:
  • rt2500 wireless drivers (newer ones should be available in-kernel)
  • slmodem (not even latest unstable does compile)
  • FIXED: acx, acx-firmware (latest acx 0.3.38 doesn't compile)
  • FIXED: madwifi-ng, madwifi-ng-tools (latest unstable doesn't compile)