Wow That's a huge investment there. Congrats. The answer to is it better than human sex. Well depends on what you want. It has unlimited stamina and controllable rhythm. However a less natural feel than skin to skin contact and the toys you use on it have to be able to connect to it. So depending on brand and model you might be limited to what toys you can use. I see many couples use them to spice it up and to add some creative kink with it. Like binding her up and letting the machine run till she's a quivering ruined mess. Heheheh. There is the human quality though with the emotion connection the physical touch and ability to pull push choke etc that some might be wanting that a toy won't be able to do.
I think the real answer is its all about what you want and what you enjoy. If you like it and it's good for your needs then keep getting up with it.
What was the question? Is it better than what?
I undetstand that sex machines are better than real life because they can help a lot in your fantasies. Feeling submissive or loosing control maybe. Anything you come in mind.
Was flicking through porn channels the other day and saw a sub on a dining table being groped by a group of people and she was being fucked by 2 machines one in pussy one in arse. Looked very humiliating for her while everyone was chatting and fondling her. Think in that sort of context they could be a good thing