Originally Posted by xilios

The Tundra III is on the large side but many (world) travelers use the Hilleberg Nammatj GT and the Helsport Fjellheimen X-Trem Camp :
The Tundra III is the longer of the three 15cm and 20cm, +/-2lbs heavyer, nearly €600 cheaper and has the side entrance (which really comes in handy in warm weather).
But I think the biggest adventages for using a tunnel tent (for us) is the amount of space (very comfortable while waiting out a storm) and the possibility to keep the inner tent and the rest of our gear nice and dry (while setting it up or putting it away) in bad weather.