I actually bought a month Vixen Plus account on Nov. 3rd. Vixen Plus is paying $59.95 for all 8 sites: Blacked, BlackedRaw, Tushy, TushyRaw, Vixen, Milfy, Deeper, and Slayed.
There are limitations to the subscription. You can only download 25 videos per week per site so you can't go crazy downloading TBs of 4K videos. However, you can stream unlimited on these sites. I had no problems streaming and downloading the latest videos on Blacked, BlackedRaw, Tushy, TushyRaw, or Vixen. You also cannot use a download manager based on the tech on these sites. I've previously had accounts with Exploited College Girls and Naughty America and those sites you can use a download manager with no problem.
The problem is the other sites: Milfy, Deeper, and Slayed. I couldn't stream or download anything recent. The most recent videos I could stream or download from the sites were of the week of July 30th to August 5th.
I complained to support and you know what they did? They cancelled the account and refunded me. I didn't even tell them to cancel the account or ask for a refund. I was still downloading some scenes. They just went ahead and did it themselves.
My assumption and this is only an assumption is that you can only stream or download the most recent scenes from Milfy, Deeper, and Slayed if you've been an account holder for a long, long time.