Line6 Helix HX Effects

I was first surprised about this device because it has so many fine features, editing solutions etc, sounds good also. After a short moment while using this device I met serious quality issues. First dialer pot got stuck, so I returned the device back to Thomann and received another one; but...again problems appeared, the power supply got broken, it suddenly made a bad buzzing and crackling sound , and did not give power anymore; returned this device also. Looks like there are quality issues with this device?, obviously very cheap components has been used and all these problems did not assure me anymore to order a new this model device, so I returned also this. Now I consider finding some better quality, another brand multieffect? All brands are nowadays produced in China, so whatever brand could have same kind of problems? Maybe, maybe not. Anyway during my 40-50years music hobby history there hasn't been any quality problems with any effect device I have bought, luckily. Where is "the" quality going today? I hope Line 6 manufacturing staff get correct feedback about the quality. Customer pays, and finally stops paying when quality goes bad. Not any bad words about Thomann staff who have been handled everything as good level as usual : )