If you take advantage of the 5% bonus categories (they change every quarter) and if you shop online it's a good deal. My first statement I made $28 and only had the card 2 weeks. I buy shoes through Zappos a lot and now I will get 10% back for all purchases. I just realized they also have another shoe store, something like onlineshoes.com and that one gives 15% back on purchases through shop discover. This by far is the best shopping rewards card I have seen. The 5% categories are really nice, but if you don't take advantage of the bonus categories or you meet the cap, then their standard 1% is lousy because you have to spend a certain amount and tier your way up from like .25% or something. For me though, I push everything through my rewards cards, so I'm easily making around $50-60 per month between Discover and Chase Freedom Plus. I've recently decided I will take the cash back and then turn around and dump it into my high yield savings...seems like the smartest way to use it.
I app'd for the More card but switched it to Open Road upon receiving the card. Got the card mainly for the 0% BT. Also use it for gas. Figured I won't be using the card for other things besides gas so I opted for the Open Road.
One thing I love about Discover is they have the best customer service.
As a supplement to another rewards card like the Chase Freedom the Disc More is awesome! More gives you a category that changes quarterly and gives you 5% cash back on the category with no minimum spending level before you see the 5%. So use the Discover on that quarterly category and your other rewards card on all other purchases and you're golden. Just keep track of when you've hit the cap on the More's 5% bonus, because it's usually relatively low.
I have had the Discover More card since April and so far, it is a good card (I wish I could say the same for Amex). I am working on paying off the balance transfers that I have on it, but use it maybe once a month.