In short, a reasonably spacious 3-4 man tent with some nice little innovations.
When looking for a tent recently, I conducted some online research with the primary criteria of decent headroom in the porch area, no more than 4 people, not too large a footprint, and not too heavy - and my attention was quickly drawn to Terra Nova's Etesian 4, which ticked all my boxes. I was slightly hesitant because of its unusual look but decided to go for it because it seemed to offer all I wanted, and I was not disappointed - it's a brilliant tent.
The tent has a pretty compact footprint, measuring 380cm (12'5") by 240cm (7'9"), so it occupies a relatively small area for the number it sleeps.. The side wall guy lines are placed quite close to the tent so you don't need much space to either side, and the front and rear ones don't stick out too far either. The guy lines, and the tent itself, have reflective sections, so they are visible on a moonlit night.
The headroom in the porch area is a generous 195cm (6'4") at the highest point, and a pretty good 180cm (5'9") at the door, so there is plenty of space for all but the tallest of people to stand in. There is a sewn-in groundsheet for the whole of the porch, which is separate from the inner tent groundsheet but underlaps it by a few cm so you are protected from the ground throughout. Looking at the photo of the tent, I was a little concerned at the sloping nature of the door, thinking of rain ingress onto the porch groundsheet when entering and exiting, but those nice people at Terra Nova have thought of that. First, there is a small awning that juts out over the doorway, offering some rain cover, but - and here's where they have a nice little innovation - the front half of the porch groundsheet has a zip around the edge, so it can be undone and peeled back. This means you can go in and out of the tent without stepping on the internal groundsheet, zipping it back into place at night so you have full protection all round. I recently used this at a wet camp over a long weekend and did not once get any water or mud anywhere inside. If so inclined, you could also use this piece of ground to safely use stoves whilst being protected from the elements. This section also has two windows, one on each wall either side of the doorway, with detachable (toggle) curtains, and two detachable (also toggle) two-pocket accessory hangers (so four pockets in all).
The removable (toggles) inner tent has its own sewn-in ground sheet and is, again, of reasonably generous proportions. At 218cm (7'2") deep by 225cm (7'4") wide, it is long enough for anyone to sleep full-length, and wide enough to accommodate a very comfortable 3 or slightly tight 4 people, with enough head room at either end of the compartment to comfortably sit up in, even at the edges where the wall angle is so steep that it doesn't cut in very much until higher up. The compartment also has two accessory pockets attached to the wall on either side, so four in total for the inner tent, making eight for the tent as a whole. Here is where there is one slight niggle: the tent does not come with a divider, so you will have to purchase this separately if you want to break up the sleeping area into two sections. If you sleep fewer people, then there's plenty of storage space for rucksacks etc. in the inner tent but, if you are at full complement, there is ample space in the fully-protected porch area anyway. The sleeping compartment and the porch area both have good ventilation so there is low risk of condensation or, if cooking in the porch, dangerous build-up of carbon monoxide.
The Etesian 4 takes around 10-15 minutes to erect by one person (even if you've never pitched it before), and even less with two. It is easy to erect, with a simple colour-coded 4-pole system. The poles are alloy rather than carbon-fibre, and the pegs are also of robust alloy 'v'-shape so don't bend easily. It is equally easy to take down and packs into a small 55x17cm (1'8"x6"), with an incredibly light packed weight of just 6kg (just over 13 pounds).
I am very pleased with this tent, and struggled to find any criticism of it apart from not having a divider for the sleeping compartment. It was exactly what I wanted and, in fact, exceeded my expectations - the zip-up porch groundsheet is a great little innovation that, in wet weather, you'll be really appreciative of.
Nice one, Terra Nova.