I have a Redline 'cross bike that I did some light touring on, and it was quite nice. Stable as all get out, even when it was poorly loaded (nearly all weight on the rear).
I had it setup with an Apex RD and wide cassette, and tried using it for a hilly route one time - terrible idea. The Apex/cassette were wonderful (90rpms going up a 16% grade...), but descending was a bit unsettling. The geometry didn't feel right (I did not drop the bars down the 2" to match my road bike's drop, and I was definitely not confident going even moderately fast down hills.
That being said, I'm sure that, with time, I would get used to its behaviour and become confident leading it down on a curve at 30+mph.
On the other hand, it is wonderful just riding around the city at a leisurely pace: higher position == more visibility and comfort.
I've used mine on road tires, felt higher (higher BB and higher headtube) on fast corners, still stable though cause of a longer wheelbase.