I have purchased one Netflix account from Decimation. The seller is extremely responsive and delivered promptly. Keep in mind the account may be set to some alien language.
Service review
I bought one account from the seller on 10 February. The account stopped working after only one and a half week. I managed to watch two films during this period. I did not touch any information on the account. I messaged the seller. The seller stated I was probably just unlucky, and if I am unsatisfied, I was told I should buy from another seller instead. The seller assured accounts are not given out to multiple buyers. The seller also indicated my account would be updated on Sunday. The seller has not followed through so far. I will update this post should anything change.