Bought this tent last year in order to complete the West Highland Way and it proved generally very capable. It poured every night and despite having to pack it up wet every morning, the interior was still comfortably dry when put up again at the end of the day.
The ground sheet is very thin and at first appears like it will not be very durable - but under usage it holds up well. On one occasion it let a small amount of water through, but to be fair I couldn't have been camping on wetter ground short of pitching in a puddle.
People who say that the space for 2 people is very tight are correct, and there isnt enough space for 2 peoples gear in the porch area (really this is best kept for boots), and it's necessary to leave bags outside. I use the tent out in the middle of nowhere so this isnt a problem, but this may be a consideration if your planning on using it in busier locations.
The side door is very useful as it is very tricky to climb in via the end door, especially if you have luggage in the porch area to clamber over. However, the side is not so useful in heavy rain when the tent does become pretty difficult to get into without allowing rainwater into the interior. You very soon get the hang of this though - just a bit frustrating at first!
In terms of stability thr tent is outstanding - multiple guy ropes, and a low wedge shape meaning that it will stand up to huge winds. The pitching system (which in gneral is ver straightforward and quick) should also make it far easier to pitch in high winds than most tents, especially with two people on hand.
Another impressive feature for me is the ventilation system - the roof of the inner skin is mesh while there are mesh openings at front and rear of the outer skin. This allows heat to escape keeping the tent reasonably cool in hot weather, while avoiding a draught through the sleeping compartment in cooler weather, and is very effective.
Although at 2.5kg this is by no means an exceptionally light tent, i get the impression this is because the fabric is of heavy duty quality, as the pegs, poles and groundsheet weight is kept to a minimum. Also, the pack size is very good - many people mistake it for my sleeping bag! Packing the tent away into it's bag is very easy as well, i have never once failed to roll it up to size first attempt and that's more than can be said for most tents i've come across.
Overall, this tent is excellent value and ideal if you are looking for a high quality, high performance, compact tent for backpacking.