Mostly I like this steeper, I keep it at work to brew loose leaf there.
I find I have issues with getting it to drain fully with certain teas, though, like my silk oolong. The leaves just expand so much, they tend to cover the little nub of the filter that has holes in the top to release the suction, so some liquid remains until I use something (typically my finger) to nudge them aside and allow the rest of the liquid to drain.
After that, too, even if I let it sit on top of the cup for a while, when I remove it, it tends to drip on the table. I’ve solved this by leaving it on top of an extra mousepad I have, but it’s a little annoying.
You also have to be careful to set it down on an entirely clear space. Once or twice I’ve accidentally gotten the edge over the keyboard or a low cable and didn’t notice for a minute that it was actually forcing the steeper to drain.
Overall though, it’s pretty convenient, and I like that it’ll fit over any mug or tumbler I have.