Ok, so I got one of the review copies from Ruoall a few days ago. It was a review copy of 1000 views.
The views took about 2-3 days to complete. Views seem to come in at the promised rate (300-500 views per day). I did not get the full 1k views though and only ended up with 728 views. The views got stuck at 301 for a few hours then moved past it. I would guess that some of the views were 'lost' while it pushed through getting past the 301 checkpoint. Views are 100% Youtube watch page playback with about 55% being from an external website and about 44% being from an unknown source. Retention isn't that great. On this particular video, it's only at 21% retention which is pretty bad for ranking. It averages to around 1 minute per view for a video that's 4:44m long.
With this said, Ruoall's service is one of the few that has given me the least amount of problems and his service seems to be pretty rock solid from my experience. He's has a hiccup recently and hopefully this is a step in the right direction so he can bounce back fully. Prices are a bit on the high side but hopefully you get what you pay for (safe views). I've ran into no issues when getting refunds from him so I feel safe using his services. I've already put in a couple of more orders, even while the review copy was already going on.
I hope everything works out! Also, get the retention higher please!