Letting people use it is the thing. I'm not criticizing the original poster, just simply pointing out that this a valuable lesson learned. Nobody is going to treat your iPad the way you do, so think wisely. Also, that's good that apple was willing to give you credit for an iPad that suffered accidental damage. I know a replacement would have been nice but that's a lot better than having to fork over the cash for the total cost of a new one.
Also Rickt, have you considered putting a warranty on the new one just in case something happens. They say lightening doesn't strike twice, but since you aren't sure who damaged it, it probably wouldn't hurt.