I definately do......I get back $5.00 for each gift card I buy & save $3.50 per movie ticket.
So, I purchase restaurant gift cards to budget in our monthly dining out & save quite a bit on vacation tickets & meals. I also purchase gift cards for the stores that they offer (Target, Toys R Us etc) and when Christmas comes, I use the gift cards and everything is pre-paid & because of the $5.00 back on each gift card, that's like saving 20% right off the top.
I can't really give an estimate of what I've saved, but it's much more than the monthly fee....
I hope this helps!