Pros
You make tips and get to shop at a lot of stores. More areas are open for delivery. You don't go far and have specific zones, like cities, you stay in usually. They give you a special tier of being a Dasher when you're doing the best deliveries, they're called tiers from silver to gold to platinum. Platinum gives you the dash now button allowing you to dash whenever.
Cons
Sometimes the delivery will get marked as if you didn't deliver the item and it gets put on you. There's sometimes drastic waits between orders. The restaurant may be closed or out of the thing the customer ordered. You can't decline order or else the acceptance rating goes down and you'll lose the certain requirements to be a higher tier driver.