Loads of issues? No. But, they are annoying, my 2010 GT650 blew it's shock once and later on the charging system failed, replaced with ones from electrosport but either I got bad parts or did something wrong, working on that now. Got it with around 8,500 KM so can't tell what issues it had before that, but the battery did leak on the frame or something as the mechanic told me. My 2014 GT650R blew the fuel pump relay at exactly 3,000 KM, later on the fuel gauge floater got stuck and I got stranded as a result hehe. and now at 20k KM I blew a bearing and got some teeth on the gears damaged so now I have to decide to either get new gears or change the bearing and move on with our wounds and scars.
Would I buy another Hyo? I don't know, I'm not encouraged, but they are cheap. Do I regret buying them? No, I already had a lot of fun with them, more than the frustration.