Same results here. I've now applied it to Macs and CustoMacs with 10.6, 10.7 and 10.8.
Success without glitches in all six+ cases.
The fact that at completion it requires a reboot, *but does not force it immediately,* suggests this cluster of patches is less intrusive than most Security Updates.
Still, with CustoMacs, be leery and do as recommended: create a clone; boot from the clone; test the patches on the clone.