i used to run a 200 bike hire fleet, most of the bikes had quando hubs on them, 8/9 speed. they weren't too bad generally but they were basic.
the issues i had were:-
when the freehub body dies, it's an absolute pain to find a replacement, but they are available, most common way to remove them is a massive allen key into the non drive side after removing the axle etc, i found the best way was to clamp the allen key in the vice then mount the wheel then use the rim for leverage, can't remember if it's a left handed thread though, it was ages ago.
other issue is they tend to use 2 ball bearing sizes, 1/4 in the non drive side and 7/32 in the drive side so this also means 2 different size cones if they need replacing.
shimano hubs are better by miles in my opinion, even the basic models, the freehubs/cones/bearings are also really easy to find and the bearings are the same size both sides of the hub.
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