There are a few problems with the red card:
If you do part cash and the rest on the red card, you are denied your transaction. I had 5 guests this week alone with that same issue. (this is a global issue and they are hoping to fix it)
Also, they will allow you to use your card 3 times before activation before they will stop you from using it. Then you have to call to activate it.
If you use your card for the first couple of times with large $ transactions, they will not let it go through either. (this is with the debit)
Some people have told me that if you try to use it an on the fourth time in one day it will get denied, I have not had this done personally, so I am not 100% if that is true.
One last thing, if you use your card and ask for cash back, and you use it again and ask for cash back, it will freeze your account, and you will have to call the 800 number for them to fix it.