It works well if the loose tea you're using is the right size. Big leaves and chunks won't fit.
When it comes to infusing, the tea stick is pretty tall, so it's fine if you drink your tea in a mug. If you're using a short, fat teacup, this isn't going to work so well.
My pet peeve when brewing tea is that I don't want bits and pieces in my tea - I want a clear liquid without bits of leaves floating on top and gritty bits on the bottom. The tea stick doesn't spew bits the way my poorly-designed tea ball did, but small bits escape through the holes.
I like the way this tea stick looks, but I'm less enthusiastic about the function. With some teas - the ones that had pieces just the right size - this worked perfectly. With other teas with larger or smaller bits, it was much less successful.