The website says they have a refund policy if the model you download has errors. You think it will be reasonably safe.
You download a model (and pay a lot of money) and discover, while the previews look good, the model is missing important parts, wholely inaccurate and a lot of the detail has been guessed / made up.
You ask for a refund on the back of the errors - and they refuse, saying they are selling interlectual property which cannot be returned once downloaded.
In other words, their guarantee and refund offer are at best, a lie. Closer to a scam in my opinion!