softwarecascade.comは安全ですか？

Buyers beware. I considered purchasing a win 10 key from them(if it works, it works!); but upon further review, they have some complaints registered with the Better Business Bureau and various forum posts describing them negatively. They appear to(without microsoft's permission) sell the same MSDN or educational instituition keys to multiple users which can sometimes be problematic for the purchaser. Spoke to site's customer support about the keys they provided, they alterated between saying a key was retail and single-use. Additionally, they would not explain their affiliation with microsoft, which they do appear to actually have as an 'Authorized Education Partner' as of now. Ultimately, site/business does not appear to be reputable. Alleged, in a forum post, to be affiliated with softwareking.com, Luke Vaggers, and Winston Cabbel. ***** ***** MS partners: *****