They are cheap panels made from cheap products and wont last even one year. The 5 year warranty is just a eye wash and by the time you get your panel exchanged\serviced under warranty, you would have gone mad.
The service center is one of the worst, with people not even responding to phones or mails. They just keep pushing the customer back with excuses.
Never buy any product from Koryo, if you want to use the product for more than 6 months.