The sponge refill performs well as to absorption and ease of use, i like it. Easy to put in a new refill as well.

The big hassle is removing the tab/s. As per instructions on the packet "use finger or thumb to push tab/button". It's never that easy. The tabs are sturdy, it can break your fingernails. Then i had to use a knife to cut the tabs, which i find it equally difficult as well. Old sponge was oozing with water. Very inconvenient and messy.

I marked the tabs with red arrows on the attached images, and its location on the mop head.

I wish the manufacturer can find a better way/s to make it easier.