In reply to Nick Bunton:
I have a Tempest 200. Its fine as a 1 man tent and ok as a 2 man for 1 or 2 nights but quite cosy. I carry that on my own so if you wanted to go for a larger 300 split between 2 backpacks you probably wouldn't notice the weight.
Ive been impressed by the durability of the tempest 200. The first night I spent in it was high up next to hard tarn below Nethermost Pike, the rain lashed down all night and the wind was howling something fierce. I hardly slept and was worried about the tent it was that bad. In the morning though the tent was fully intact like it hadn't even been windy and although the ground had become waterlogged beneath the tent I was completely dry inside.