I've ridden one off and on for the last two years. They are ok, so let the guy buy one. It just another facet of cycling. Mine's lighter. Mine's heavier. Who cares! I have a sub 18lb. bike for club rides. I have a XC for when I want to go offroad. I have a tandem for when my daughter wants to tag along and not get dropped.
The shaft drive is great for when I need to do a quick trip. Nexus shifts great, no chain - just a clean cycling experience. I really like it when my dog and I are out together. She has a tendency to bite pant legs and stick her nose into the drive train. With the shaft drive I do not have this problem.
just my 2 cents.