High-quality sex toys are often an investment, and that’s doubly true for sex machines. Some come with price tags into four figures. So before buying, it’s important to do your research and make sure the sex machine you think you want is actually good fit for you and your desired sensations.

Ahead, Queen offers a checklist of questions to consider while shopping:

• Is it easy to clean?
• What’s its RPM range? (A sex machine’s high-power function might be too much for some users, so make sure it also has a lower one so you can find your groove.)
• Will it take the weight of anyone who’d want to use it?
• Do you know who manufactured it so you can contact them if need be?
• Can your home’s electrical system handle the power draw?
• Does it look like fun? Can you picture yourself enjoying it?

Unfortunately, there’s no official seal of approval for sex machines, so it’s important to shop at reputable sex toy stores that have already done extensive research on the brands they carry. “Shopping with a reputable retailer is one of the best ways to ensure you’re buying safe, legitimate products,” says Frye-Nekrasova.

User reviews are another helpful resource when considering a serious sex machine investment. “Actual user feedback will help you determine if you can achieve your desired fantasy,” says Tomchesson. “In that vein, sex machines that offer versatility are the best investment and can be used in a number of ways to achieve different sensations and experiences. Compare the features and user reviews to find your perfect match.”

You can also read reviews on retailer and manufacturer websites, Queen suggests, with one caveat; “Just remember to read between the lines for ‘This person was expecting something the machine could not deliver’ vibes or ‘Yikes, seems like they probably used it wrong.’ [These reviews are] definitely informational, but not necessarily indicative of quality or your own experience.”

As with all sex toys, “best” is subjective. Ultimately, the best toy for you will be the one that has the right features to meet your needs. So with that in mind, check out these 12 popular and well-reviewed sex machines: