This was my 2nd tent previous being the Vango Nevis 300, so far I've camped a handful of nights in the Vango Helium UL 1. I found the smaller pack size and weight great when hiking long days.
The vestibule size on the diagrams I feel is a tad misleading as I found the Vestibule to be no way near 50cm (145cm - 95cm). I recently pitched on Pen Y Fan overnight and despite me pitching the tent not according to the wind and there being a lot of side wind throughout the night, the combination of the guy lines and TBS meant that the single pole didn't move at all and the tent was very stable (even if the fly and inner billowed all night). I personally like to combine the tent with a groundsheet in order to protect the floor of the tent.
On the door side of the tent the fly stops about 10cm from the ground, this aids ventilation to avoid condensation. On the other side of the tent the fly extends to the ground, this helped to stop the wind from hitting me inside the tent. The door on the fly clips onto a little O-ring on the inner when stowed away, this works great but if the fly was wet, this could cause the inner to also get wet.
In the picture you can see how the tent is pitched, to note the bag can fit in one half of the vestibule, I simply didn't have it in there at the time.
A couple things I would change about the tent would include a larger vestibule so that you could cook in it (I had my cooking system outside the tent which wouldn't be great in poor weather) and the zip to curve along the line of the tent at the top with a little rain cover at the top, this would enable additional ventilation when it is raining.