In reply to Alex Riley:
I have a Big Agnes Seedhouse SL2, and it's been brilliant in the year I've had it. 1.2kg and seems pretty bombproof in typical UK weather (though it wouldn't be my first choice if I were doing a lot of winter stuff). The drawbacks are it's made of some very lightweight fabrics, and it's easy to put a hole in through stupidity if you're not careful. I put a hole through both the footprint and inner from what I imagine was pitching on a sharp rock, and my stove made a nice L-shaped ventilation flap in the door of the flysheet where it'd pressed against it in the wind. Easily patched, and lesson learnt!
Big Agnes customer service have also been fantastic, replacing an inner without argument where the mesh on the door had started to fray and separate from the zipper.