I have used a Miniumus, and own a Minimus Vision.
First, the claimed output of a hundred lumens is a bit conservative. My Minimus Vision (claimed under a hundred lumens) is almost as bright as my Zebralight CR123A headlamp. The color on the Vision is gorgeous too.
However, Surefire headlamps all have glaring problems: a ringy beams, a prism that is the most annoying thing in the world, and a squeaky/stiff rotator that makes it impossible to adjust the light one-handed.
The quality versus cost is simply not proportional.
I too have a Vision, and had a bit of a play with a Minimus (which I found somewhere I would least expect to find a Surefire, but that another story)
The Vision has a brilliant tint, and mine is pretty smooth, although there is some rings around the outside edge of the beam.
As for the stiff adjuster - mine is loose enough I can adjust the output with one hand, but I did have to tighten the angle adjustment a little bit (there is 2 tiny set screws behind the neoprene pad- It does need reloctiting again now I have adjusted it though)
For what I use a headlamp for, the Minimus Vision is perfect.
it has a nice wide flood that reaches out a useful distance on high, but it also goes low enough to have minimal affect on my night vision (and comes with a red filter - if I need it)
i typically use a headlamp for working in fairly close, when I need both hands free - if I needed something with monster throw, then this wouldn't be the light for me.
I would like the Saint battery pack though, being able to run either 1, 2, or 3 x 123 cells, or 2xAA cells to get longer runtims or if I can't find 123 cells, would be great.