This is hands down my
This is hands down my favorite coffee cup for keeping my coffee hot with no metallic taste. I have three cups and eight inserts. Two of the inserts leak with the travel lid on. My advisement is to definitely purchase Vinglace products, but immediately check the inserts for leaks. Their customer service is fantastic, and they will honor any defects. Even after knowing the possibility of leakage, I have still ordered additional inserts since I use them every day; I just check them immediately upon their arrival. It's not the lid that leaks, it is the insert. Believe me, I've done multiple tests with multiple combinations. Put the lid on; cover the holes; tip the cup as if drinking. If no liquid seeps out, you're good to go! If it drips at all, contact Vinglace. As a company, they are awesome!