As others have said, I have it, I use it, and I love it. lol
Seriously, we put EVERYTHING on it...the mortgage, the gas, electric, phone, pre-school tuition, dh's graduate school tuition (which his company reimburses him for, so that is a real bonus!), gorceries, literally every bill we have goes on that card. Plus, DH travels for business a bit, so we are able to put his flights, hotels, etc. on our card and then get reimbursed for that as well.
And then, we pay it off IN FULL every month. You have to be really good at maintaining your finances if you do it this way. It is so easy to look in your checkbook and say "Oh wow, we have a ton of money right now, I can buy this..." while forgetting that you have ton in your account b/c you charge your electric bill. So, if you are really good at budgetig and monitoring, then I think it is an awesome thing!
Like others have said, we started with $100 free dollars since DH and I each got one (separate accounts, though we both have cards for both accounts). Then, we put everything on it for several months leading up to our trip, and we ended up with a whopping $560! It paid for our whole dining plan for all of us!
So yes, it can add up. I guess we are lucky though, as many cannot pay their mortgage on a card (this really adds up, as you can imagine) plus all of DH's business expenses which we get reimbursed for. If these were really all of "our" purchases, that would mean 50,000 on a credit card in a year! Yikes!
And yup, DVC went on it, too!
I will say, though, that we have NOT had good luck with customer service through Chase. If it were not for the points, we would have dropped them a long time ago. But, being Disney junkies....well, you know the story....