Dollar store pregnancy tests?

First off I've never bought them, but i noticed the picture on the box looks exactly like the pregnancy tests my doctor gives me. They're not a stick you pee on, it's just a little white rectangle with three circles/ovals. the control line, the test line, and a smaller one you put the urine in with a dropper. You can't buy this type in drug stores, I've never seen them anywhere else except the dollar store... has anybody used them, are they reliable or not even worth a second thought?