I got this to use with my current mugs. I think it’s worth the $8. The mesh is very fine which makes it nice for loose tea as only the very finest of tea sediment can pass through the mesh. That said, however, when using this on mugs other than the ones for which it is designed you have to be careful. Make sure to add water to just below the rim of the infuser to contain the tea leaves if using in a larger rimmed mug or cup. Very easy to clean and I’m glad for the purchase.
This item has worked well for me. It fits some cups better than others- related to the size and shape of the device and its hanger. The hanger can be bent to help with fit to most, but still doesn’t work equally well with all cup shapes/sizes. I found it to work well with various types of loose tea and allows a generous capacity for when larger amounts of tea leaf needs to be steeped.