Ringtons Tea & Coffee

Great little tea infuser this. Innovation where previously there was just tradition! A few very minor issues:
1. You need to get used to a slow pour to start as otherwise air can get trapped below the straining mesh and 'burst' the strainer out. This can be hazardous if tea leaves get lodged in the valve and prevent it from closing, allowing hot tea out, uncontrollably. This has happened to me, but shouldnt ever be a problem as you'll always have a cup handy.
2. Expect some tannin discolouration if you are not religious with handwashing. And damage to the mesh if you dishwash regularly.
3. Do not let visitors use it without a demo or explanation!
4. How do I make tea for 4? (Maybe a new product idea?)