I picked up one of the duo wands when I went to play with the Lightness of Being testers and I have absolutely loved it! I didn't expect to find an HG product but so far it has been perfect for my undereye darkness.
I tried the Prolongwear concealer with the pump top and the color was good but the formula ALWAYS looked dry and cakey no matter how much I buffed or tried moisturizing the skin. I wouldn't even set with any powder and it would still dry down cakey for me. The duo wand is smooth and and pigmented for me. When it dries down, I just see normal looking skin with just the right amount of concealing and color correction.
I have dry undereye skin so if you are very oily to begin with and find you need to powder to keep concealer in place, this product might not be a perfect match for you so definitely play with the texture even just on your arm to see how it feels.
Hope this is helpful and Happy New Year!!