Discussion Vistaprint for business cards?

I'm in need of some business cards and noticed that Vistaprint often runs dirt cheap promos where you just pay shipping. For example, they'll have $10 for 500 double sided colour business cards on 100lb stock (both matte and gloss). They also give you free stuff like stamps, pens, notepads etc.

BTW: They have a Canadian site at http://www.vistaprint.ca but prices are higher. You can order from the US site and it'll still ship from within Canada.

I wanted to know if anyone could comment on the quality of their products before I put in an order.

Thanks!