I've never had an issue with KUK. In fact I recommend them to alot of people online looking for kratom. I had my only one issue resolved very quickly. It's just the price. I am finding I'm getting bouts of dizziness with the white kratom from kratombird. I did try going back to KUK and didn't really notice a difference in quality. Still bouts of dizziness. So I just went back to kratombird as the price is quite a big difference.