I think there are two types of "standing", here. One is standing up on the pedals, remaining upright, and having your arms more or less straight out in front of you. Almost like on a stair-climber machine. For that position, bikes like the Roll and others with that geometry are comfortable, because you can remain in that upright standing position. The other type of "standing" is getting out of the saddle with your body up over the bars, and your legs more or less pumping down vertically on the pedals for power and speed. For that position, bikes like the Roll are very difficult or impossible to use because the handlebar position is so high, you can't physically get your body over them and into that hunched position for most power production.