Janitrol uses the same parts as most other manufacturers and even supplies their equipment to other manufacturers for use as their label. Their warrantees are as good or better than many products.
One reason for the cheap reputation is that the price is so low that many inadequately prepared moonlighting installers use the equipment to make the sale. A high-reputation company has more overhead and is very careful to protect their reputation. So I would select the equipment based upon service company reputation and long-term appearance of the equipment. Look at the neighbors and friends units. Take a walk around a neighborhood or two and look.
I do not see a great advantage in making a unit last more than ten years, By then the technology has changed to improve the efficiency and operation making a change advantageous.