New Missions have gone live on Inline Warehouse and have a new insight video
https://www.inlinewarehouse.com/Mission_Roller_Hockey_Skates/catpage-MISSSKATES.html
I got them when they first came out and have 3 of them, different colours and weights (4, 6 and 8). I agree with you, they are rubbish unless they are on a completely smooth ice like surface. A green biscuit kills them.