Possibly the worst service you could ever imagine. If you ever needed evidence that Double Pizza are just in it for the money, simply order / drop by any of their restaurant and be amazed at how they do not give a damn about you.
And if you need more evidence, you can order on their website when the restaurant is closed, and you'll just wait forever for your order to get delivered: no closed noticed or anything.
On the plus site, since you can order from their completely broken website when they're closed, you can totally abuse their fraudulent "double pizza dollars". Just place a few orders when they're closed, get the dollars, then use them later.
Shitty restaurant is shitty.