At first, I was skeptical - every toy I've tried with any kind of vibration has always been loud or felt like the vibration wasn't anything more than an afterthought. This toy, the vibration is very prominent and shockingly not even very loud. This is a loud toy, but not for that reason. There's a hole to allow air to flow during use, so it moves freely, the hole is small and almost becomes a whistle during use. If you cover it, the toy can't perform properly, as it creates a vacuum and becomes immovable. Other than that, this feels really nice; it's easy to clean and maintain, it doesn't go through batteries at an alarming rate, and the vibration can really be felt throughout the whole toy, not just in the area closest to the vibrating mechanism.