I've got a 40k gallon pool square with a fiberglassed retro over the original gunnite, so it's super SLICK!
up here in the central valley the dust is so bad we have to run the cleaner 4hrs a day or there's mud, plus my neighbors all have big leaved trees that drop tons of shiat in the pool
started with this Zodiac G3 and really liked it until maintenance was to often
cleaned the dust/mud great and climbed the slick walls with ease
problem 1 was the suction valve getting clogged with leaves or rocks
problem 2 was the suction valve splitting and needing replacements, then that ramped up from once a year to 4 times a year and we switched cleaners
the big disc lasted about 3yrs before needing replacement, but there is also some odd pieces inside that had to be replaced
overall CHEAP to use and easy to get parts
Now we have the Hayward Auqanaut
cleans pretty good, but the crazy twists and turns from the mechanics can leave dust/mud spots all over the pool so you see the tracks it took even after 4hrs of cleaning
climbs the slick walls pretty good
took a while to get the valves set enough for the 11-14 revolutions a minute, and doesn't always climb to top water line, looses suction and falls
so far maintenance was been new rubber wheels every spring, they breakdown from dark blue to light blue white and need to be replaced
overall does a GOOD job not great and so far parts are easy to find