Tis true about the steel frame on a Yamaha. I bought the electric Yamaha extended version 7 years ago. Everyone who owns a Club Car was surprised at the difference in the ride. But alas - I had a choice of buying a new cart or homogenizing my existing cart. Polo put my Yamaha chassis on a Club Car frame.
I have no idea of the life expectancy of any of these vehicles. Right now the MUD PUDDPLES are so deep and full of mud that my brakes keep failing.