In reply to benghull:
> its an inner pitch first which may influence your choice if only really using it in the UK
They're all very similar, very conventional 2-porch, inner-first, 4-pole geodesics.
Personally, I don't buy into the 'outer first is best for rain!' argument... its a bonus, but if your inner tent isn't made of mesh (and if it isn't actually epic monsoon rain) then it'll keep the rain out long enough for you to pitch the whole thing. You can cover the inner with the fly when you're threading the poles, with a bit of practise.
For me, outer first is a *huge* benefit when dealing with strong wind, because you don't have to fight with an enormous flappy sail. Means you can pitch tents singlehanded even in really nasty conditions, which is a potential lifesaver.
If there's two of you, and you're practised, inner-first geos will have a really nice stable pitch whch is what these four are aiming at, right?