well it definately is BLUE and that is good as you can't accidentally use it on the road.
I used to use an old tyre instead. However this one gives more friction and, surprisingly, does what the manufacturer says...reduces noise.
I have no problem with slip on the trainer.
The only issue i had was a flat. that may have been because i used an old (reapired) tube. Or because i inflated to 125/130 (cold winter outside use). Really you are meant to slightly underinflate by 10psi or more to allow for them to heat up and increase pressure when in use.
I think as well the tubes tend to get caught under the tyre when repalcing...so watch out for that and inflate properly and carefully.