Now that we seem to be talking about all kinds of tents, I'll contribute this one - The Oztent! It's a pop up tent that lives up to its name. I've seen them put up in 30 seconds as they claim. A friend has one and camps in it for long periods of time.

The benefits are that it is good quality, strong and durable, the straight sides give you a lot of standing room, and it can be added to. The drawbacks are that it is quite expensive to buy new, and bulky.

I've been tempted by the idea of getting one but haven't had the money. However I have another lovely dome tent now with plenty of room for the extra high queen size airbed and storage for clothes in one room and most of my kitchen stuff in another. It has a lot of interesting features including a fly which can be lifted up and sections zipped together to make an awning. I'd link to a picture, but the shop where I got it doesn't have a picture online now. The tent is surprisingly easy to put up, although you wouldn't call it a pop up tent.

I've seen toilet/shower tents that pop up. I may get one of those some time.