Work out which connection you actually need first. Bluetooth covers a room. App control over the internet covers a continent. Buying a Bluetooth-only toy for a long-distance relationship is the single most common mistake in this category, and the product page will tell you which it is if you look.
If you are the distant pair, buy one of each. A wearable for one of you and a stroker for the other. Most people buy one toy and end up with half an experience, where one person is doing all the driving and none of the feeling.
The app is the product. Motors are easy to make and software is hard, which is why this collection is almost entirely two brands. A budget toy with an app is usually a budget app, and it will fail on the night it matters rather than on a Tuesday.
Battery drain is real and nobody warns you. An hour of app control eats a charge far faster than pressing a button does, because the radio is running the whole time. Charge fully beforehand, not halfway through.
When it will not pair, it is almost always permissions. Phones are fussy about Bluetooth permissions, and a toy that seems dead is usually a toy the app was never allowed to see. Check that before you conclude anything is broken.
Check the brand still updates its app. Firmware and app updates are what fix pairing bugs as phones change. A company that has quietly abandoned its app has quietly abandoned every toy that depends on it, and that is a real risk with anything outside the main two.
For cam and creator work, reliability beats power. A toy that drops mid-show costs you more than a weaker motor ever would. There is more on setting this up in the Creator Studio.