DH and I do like Caskbill - well, at least DH does. I refuse to give up my Disney card, plus I have a lot of things auto-charge to it, like our Dish, Starband, propane gas, electric, Sunday paper (!), etc. Since I am paying for those things anyway, I may as well get something back. But DH has his GM card and charges it until it maxes out.
I also charge all groceries, all restaurant (but leave the tip in cash) trips, ... geez, I can leave for a business trip with $20 in my purse and feel safe because I just don't use cash at all! (As long as I know I'm not going to have to take a taxi...) I also love the on-line payment - I don't pay each time I charge (that would wear me out), but I do make incremental payments and then make sure I have the final full payment setup for at least 2 days before it's due (so I can check it got there OK).
Right now we have $353 for our Sept cruise, and that's after I wiped it out in January paying towards our
DVC annual dues (that's the part I REALLY LOVE - FREE DUES!!!!). Put that with a gas card from MyPoints and about $70 from NFO Survey and we shouldn't have to come up with much at all to pay for our trip! (OK, OK, the $10 gas card will only give us 3 gallons

, but how many gallons does it take to drive around WDW, anyway?)