The older model 700 trigger assembly, especially the one with the safety that had to be flipped off to work the bolt, was one of the most crisp, clean breaking triggers ever put on a factory hunting rifle. And they were just about the right pull weight for hunting use.
But they were also probably the most controversial trigger design ever as well. Everyone has seen the documentary, heard the stories and all that. But when they are kept relatively clean and not adjusted much below 3 lbs., they are just as safe as any other trigger IMO.
The X-mark pro on the other hand, I'm not a huge fan of. If I were to buy one that new I'd get a Timney for it.