I didn't use it and I think it's worthless.
I didn't use it but I like the idea, though I probably won't ever use it myself.
I didn't use it but I like the idea and may take part next time around.
I used it and it was terrible, I'll never take part again.
I used it and it was okay. It only kinda helped if at all.
I used it and it helped a lot. I'll gladly make use of it the next time around.