I just came across this review (pdf) of the MLD Trailstar shelter. The review is by Colin Ibbotson, who is probably one of the lightest of the LW walkers in the UK. It's an interesting review for us here in Tas because the conditions that Colin deals with are very similar to what we face here in Tas - wet, windy, and cold. This makes Colin's take on tarps much more relevant to Tas than most of the stuff you read from US.
Just to tantalise you, here's Colin's summary:
"This is the lightest, largest, most storm-proof sub 1kg shelter I have ever used or seen, and quite possibly on the planet. Stability is so good that I cannot think of any other shelter even at up to three times its weight that could match it. At a cost of only £112 including p&p this is just an absolute bargain for the UK environment."
Cheers,
Alliecat