School me on tunnel tents

It's time to replace my small tent and I'm considering a tunnel tent. I've done a bit of reading on the pros and cons... the main con for me being potential difficulty pitching in on less than ideal ground, though we don't have a lot of sandy campsites where I tend to boat... but would like to travel more for trips in the future.

The main reasons I'm interested in it (other than the fact that I've never had one) are....
1) the one I'm looking at it seems like you pitch the fly and then hang...

School me on tunnel tents