Mike (Lewis),
Power Director 7 Ultimate suffers from a bug in the Smart Render which prevents total Smart Rendering of AVCHD under some circumstances. It also has a buggy menu designer which can be overcome with using a non-intuitive sequence of steps. It is mostly easy to use, stable, and produces very nice AVCHD disks.
Nero and Corel both make low cost and high quality AVCHD editing and authoring software, and these have been discussed extensively in aother thread here:
Burning AVCH Disks Please Help!! - The Digital Video Information Network
Although it is lengthy, it contains a lot of comparison information.
And to both Mikes: Happy New Year!
Larry