Originally designed purely as a health device for relieving tension in sore muscles, around 2003 (right after the Hitachi vibrator was featured on a 2002 Sex in the City, causing the vibrator to sell out everywhere), the manufacturing company, Hitachi, decided to distance themselves from the vibrator to protect their brand. Unlike almost all sex toys on the market, this manufacturer isn't an adult-oriented business - it's an industrial business focused on industrial equipment, automotive products, and consumer electronics.
Instead of pulling the popular product from shelves, the Hitachi vibrator has now been rebranded under its US distribution company, Vibratex. Despite the name change, the Magic Wand continues to be one of the most iconic sex toys of the entire industry, and it is regularly considered a "must-have" for anyone seeking powerful vibrations.
Due to its intense popularity, you could argue that the Hitachi vibrator launched an entire category of sex toys - all due to its existence. Nowadays, "wand massagers" are an entire category found on most sex toy retailers. Defined by their ability to offer powerful vibrations, most wand massagers feature a long, non-vibrating handle with a "head" at the tip, where all the vibrations are centered.
While the Vibratex Magic Wand is primarily marketed as a clitoral toy, it isn't exclusively limited to clitoral use. When held against the frenulum, the vibrations can easily cause orgasm in penis owners as well. Some people like to press the Magic Wand against the anal opening to feel the vibrations in the sensitive nerves there, too.
External use of the Hitachi Magic Wand is most common. However, especially for those who enjoy stretching, insertion of the head of the Vibratex Magic Wand may be an occasional activity. Due to the sheer size of the Magic Wand's head, it can provide similar sensations as fisting - without the need for another person. (Due to the lack of any sort of tapered tip, a long warm-up is required - even before practiced stretchers can insert this toy.)
Fetish use is also very common with the widespread availability of the Hitachi vibrator. Many diaper fetishists find that the vibrator's power can be felt through the material to provide diffused vibrations all over the diaper.
Due to the power provided by the Hitachi vibrator, this sex toy is usually the vibrator of choice for those looking to partake in vibrator torture or post-orgasm torture. Since the large handle makes it easy to hold in place while the head of the massager is broad enough to easily withstand movement without losing the "target", the Magic Wand vibrator can be kept in place even while the receiver is a squirming mess.