A true and a good company is being mustered by the level of their service, and mainly on times after you have already purchased the product.
And in Korea SIM I have found both. The service, the help and all they did for me before the actually purchase and pick up of the sim card was simply great.
But not less, also after 3 days after receiving it and facing an activation problem the Korea SIM support team took great care of me and handled all fast and in an efficient way.
So I definably would recommend to but a Korea sim card.
the only problem I offer Korea SIM to fix is that those sim cards are only for tourists, and yet, the sms you get from them is in Korean.
thank you Korea SIM for a wonderful service.