Those look like they work really well! But they’re probably a lot noiser than a pillow. If you’re trying to do it quietly so no one else in the house hears you it might be tough. I think a big stuffed animal is the preferred method here!
Well, yes, inflatable toys are more difficult to handle, but the pleasure is worth it. In fact, among conventional sex toys there are also quite noisy ones, but that doesn't stop. Although inflatables are noisy to inflate and deflate they can be used perfectly without any noise: But when an inflatable squeaks loudly in time with the waves of pleasure, it's so sexy