I had an original Kreepy Krualy for many years, and can attest that they are well built and perhaps more importantly repair parts are available for all of it. The only real down side it it is pricey, you should also be aware that individual pools sometimes have issues with specific pool cleaners getting stuck. I have owned cheap sub $100 suction cleaners that worked great, and expensive $300+ ones that would get stuck in the corner on my pool ladder, the key difference in the cheap ones and the expensive ones is build quality, while a better built unit may last multiple years without doing any maintenance, getting even one season out of the cheap ones may require some creative mending. The cheapest one I ever owned came from Lowes and sold for under $100, within 3 weeks the snap together weight on the base had failed and I had to add a nut and bolt to hold it together, within 3 or 4 months friction fit tube was so loose it would fall apart when pulled out of the water and I had to wrap it with tape to keep it together, etc.
Ike
p.s. also be aware some have silent flapper valves and others make a clack-clack-clack sound while operating, this may be an issue if you want to relax around your pool while the suction cleaner is running.