[Chuck Pullen] "...for example I am working on a project at this very moment ...First I tried opening the iso's (.m2t from firestores) ...then spent another fun filled few hours trying to get Vegas to see the line cut correctly (ProRes from a Ki Pro)"
So... there you have it. Firestores and ProRes. You should probably buy a Mac if you want to edit with those formats. I'm serious. You either need to use the formats that edit easily in your NLE or use the NLE that edits the formats you want to use.
Here is the problem: HD is the wild, wild, west! As you said, Vegas was extremely stable in the DV world. No so much for any NLE in the HD world. HD seems to have no useful standards. Standards like MPEG4 AVC/H.264 are so broad that no software can support it all. Every camera manufacture uses different parts of the spec and so there is no commonality anymore. That's why I stick to standards like HDV and AVCHD and I have no problems.
So if you are going to use bleeding edge formats... expect to bleed a little. Me... I stick with the standards and get productive work done with Vegas Pro.
~jr
http://www.johnrofrano.com
http://www.vasst.com