The idea of this item is "there," but after actually trying it, I changed my opinion.
(PRE-STATEMENT) I am a man. A woman using this product for front use may have a different opinion.
First issue: the item is not easy to refill because of the "anti-backflow" system. The anti-backflow only protects the bulb itself. The tip is permanently glued shut at the base, so the inside of the tip cannot be directly opened or cleaned.
Water or material can still enter the tip section through the four holes near the end, meaning residue may remain trapped inside the tip itself. Since the base is glued shut, there is no practical way to fully access or manually clean the inside of the tip. The only real option is repeatedly flushing more water through it, which may require several refill cycles just for cleaning.
You could soak the tip in cleaning solution, but personally I do not want to deal with that.
The bulb capacity is also too small for a design that may require multiple refills. Ironically, the anti-backflow feature is what attracted me to this product, but it actually makes refilling more difficult. With a normal bulb, you can simply place the tip back into water and refill quickly. With this design, you need to take it apart every time.
Overall, cleaning and refilling takes far more effort than the actual injection, which lasts less than a second.
Second issue: the tip is quite large. It is wider than my largest finger and not very comfortable to insert, especially since additional lubricant is needed each time. The four holes also seem too large, causing the water to expel too quickly for how slow and inconvenient the refill process is.
Overall, I would skip this design