Questions about anal sex machines

I’d like to buy a relatively inexpensive sex machine for use with dildos. I’m a male, so it will only be used for anal sex. That being said, what should I know before buying a sex machine? I’ve done some hand-throating with dildos I already own and enjoy it, but I want something that can do the job hands-free. Any product recommendations or suggestions would be greatly appreciated. I’m strongly considering buying this machine after reading many positive reviews:

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