I applied for the Citi double cash card about 2 months ago and I have been using it.
The only credit cards we use, are the ones that give us cash back.
I have one card that pays 3% back on home improvement purchases, but only up to $2000 in purchases, then 1% after that. That comes in handy, since my husband spends a lot at home depot for his building business.
Then we have the Capital one quicksilver card which gives us 1 1/2 % back on purchases.
The Citi doublecash card pays 1% on purchases and 1% when you pay your balance, so I get 2% but I have to wait until I pay the card each month to redeem.Yesterday, I got my first check for $39.77, which I will add to the $20 challenge.

Prev. total $15.197.00
citi check 39.00
new total $15,236.00

(as you can see, I do not add the odd cents.)