Here is my review (got review copy of animated video).
At first, the video didn't match the color scheme of my site which was a big off for me. The seller then agreed to do the revisions which were done quickly (about 24h).
Script: he sent me a draft how the script will look like before getting voiceover done. The script itself is good including the voice actor (which I think is one from Fiverr as I heard it before). It was a bit longer then I expected.
Video: I think this could use some work. This is clearly done in some online video tool since I asked for After effects project (as I wanted to do some personal changes) but didn't get them as it clearly wasn't done in one. The quality was in FULLHD which I think should be standard in this kind of services. I think the characters could use some improvement as I have seen them in literally tons of videos (same ones at that). Not saying its something bad though. Some things displayed too fast making them "unreadable" and confusing (probably because of the script). Not the seller's fault though they should have probably seen it looked "unnatural" and do something about it?
For the price point though I think it looks okay.
Background music: do I have to say anything here besides letting you know to try and use some other "less generic" music?
Voice over: All fine here. Just try and get some other voiceover people to help you out. Some videos could probably use a female's voice (all about variety).
Ranking on YT: I think the screenshot below will talk for itself (stable for past 3-4 months):
You get what you pay for is all I can say here

though like mentioned before ... I think for the price point he is offering it should be fair enough.
Good luck with the sales and hope you will consider some of my tips to help you improve the service.
Thanks for letting me review your service even though I didn't decide to use the video.