One convenience feature I appreciate is the Cascada's seatbelt presenter. The protruding arm reduces strain when reaching back to grab the seatbelt. In two-door cars, there is a longer distance to reach the seat belt, and this seat presenter alleviates any potential discomfort when reaching backwards for the seatbelt.
I find the feature useful because the driver needs to complete this task (reach for the seatbelt) each time the car is driven. Therefore, the feature is utilized all the time, and is therefore actually useful to the driver.