Had a 125 and then the 250 in the past. Only problems I had were side stand switch a cheap £20 fix at local mechanic and its bypassed. Corroded ignition switch another easy fix. Was caused by road salt rotting. Carbs got gunked up after being stood for six months. And the exhaust down pipes are made of very mild steel. So need a bit of tlc if used through winter.
Have a 2015 250R runs lovely had the inevitable side stand switch problem. But all is good. They are much improved over the older models.
Build quality is the same as Suzukis.
Sit on both I find the Hyosungs more comfortable than SV”s and the Hyosung makes slightly more power.
Parts are interchangeable a Suzuki oil filter fits the Hyosung.