Frequently criticized
A user reported that their phone, a Huawei P20 Pro, would not recognize the earbuds at all. Another user's earbud displayed as connecting but produced no sound through their phone.
Generally negative
One user reported that one earbud worked fine while the other had very low volume. Another reported an earbud that connects but delivers no sound, suggesting inconsistent per-unit hardware quality.
Generally negative
A prospective buyer noted confusion over the product name, since it is sold as HA-Z330T on Amazon and eBay but listed as HA-A30T on JVC's official website, making it hard to confirm they are the same model.