I’m not sure how they compare between each other (Gabi and Hario), but I don’t really see much difference from manually pooring. Basically going the immersion route makes your water touch the coffee longer. That might extract more fats and make it less healthy, and in my opinion not a better taste (I don’t like other immersion products either). Taste is personal of course.

It might give you a slight improvement in comfort, but at what cost.

It’s fine with me ☕ 💪

Like most commenters, I throw them with the filters on the compost pile. But recently I had a dog in the neighborhood pulling out plants in my front garden, and shitting in it. Spreading some of the coffee grounds seemed very effective against that too. I guess the dog doesn’t like the smell. So it;'s a win-win because the plants profit from it directly too :D