The edges can start to come up. It is also a lot more fragile than gaffer or vinyl. I would only use it on grass, dance floors or carpet. A lot of people completely cover their metallic hoops with clear hockey tape. I tried it with these hoops (the pink and silver are my minis), but I thought it really detracted from the sparkle. It might not make so much difference with mirror tape though. I taped the ends of each spiral with clear hockey to keep it stuck down. These hoops have lasted for six months so far.
If you use clear hockey tape, you can still use the same method to add gaffer grip. You would lay down both spirals of metallic and one spiral of clear hockey tape then add the gaffer before laying down the last spiral of hockey.