NOTICE: This question falls into the FAQ page...
What type of questions can't be answered by Vocaloid Wiki
Questions on Personal (issues / opinions / feedback) about Vocaloid series/products
- This paragraph is on SeeU's pageon Vocaloid Wiki
Due note that this is gathered from various sources, but overall should not be viewed as the legitimate answer.
"SeeU was popular with overseas prior to her release. However, within Japan some issues between Japanese and Koreans involving fan based opinions on political and racial issues made SeeU hit a rough start. Her overall popularity ranges per website from amongst the least to most popular of the Vocaloid 3 releases and is affected by the opinions and the politics of the fans within that circle of the fandom"