If I remember correctly, the main problem with Eureka's Excalibur upright was electrical. Something about the switch panel overheating due to the two motors and the two speeds. If I remember correctly, it was not designed to handle the electrical load properly. On the other hand, can't believe it would have received UL approval to go to market if this was the case.
Though it was never highly rated by Consumer Reports, I really liked the design because it was sleek and because it really provided options for good non- carpet cleaning, with a full set of attachments on board. I may be wrong, but if someone has a spec sheet for the deluxe version, I think there was even a pocket to store a nice bare floor brush.