Mine’s on a ti Setavento hardtail – same geometry as a 2004 Marin Rocky Ridge, 1 1/8 headtube, -1?. The nice thing about slackening the head angle using a headset is that you don’t slacken the seat angle at the same time, which is what happens if you simply use longer forks, so climbing stays good, or maybe better if your seat angle is on the slack side to start with.
The other one – from Ofanaim – is on a Pace RC405 with a zero stack headtube, internal diameter 44mm. It’s a -2? and the change is more noticeable. I kept the lower cup zero stack, so I could run a slightly longer fork without raising the front end, which has worked nicely. I don’t think Works Components give you that option, though I may be wrong.
It’s made the Pace much more stable on fast and steep stuff and it still climbs really well.