The frame uses a tall head tube, and combined with a generous amount of spacers, getting a handlebar height from racy-low to almost bolt-upright is possible. If you are planning to run your bars high, moving up a bike size should help you from feeling cramped lengthwise, and the sloping top tube should provide plenty of standover clearance. I found the 56cm frame to be a good fit for me (5-foot-11) with the bars a few inches below the saddle.
When pushing the pace, the frame is pleasantly stiff, with the springiness that steel is famous for. The spring takes the edge off rough roads, and the handling inspires the confidence needed to bomb down dirt roads at speeds that soon resulted in pinch flats. (Bigger tires could be an answer, but lower speeds are probably more prudent.) On smooth tarmac the Quest corners with aplomb, leaning toward race-bike agility over touring-bike stability, responding best to an aggressive, in-the-drops cornering style.