In reply to hereanthere:
Rach.
Just wanted to give some advice as to what the extra £50 may get you / and to highlight what may be the reasons for some of the different price points with various jackets - purely from a performance point of view.
Firstly check the weight of Primaloft and type in the garment you are buying. Main choices typically range from those that use 60g, 100g, or heavier - obviously that affects the warmth, there are now also a few lighter versions also. Also check whether Primaloft One or Sport is being used, if Primaloft is your preference, they have different characteristics and benefits - one being more hydrophobic than sport. The Alpamayo uses a combination of 60 and 100g PL One.
Also then the shell, weight, durability and water resistance. The Alpamayo uses a Drilite Loft shell is water resistant (1500HH) and therefore can be used in 'anger' much more so than one which uses an ultra-light / non water resistant shell such as our Compressor Jacket or indeed one thats uses Pertex Quantum etc These latter choices are the ones to look at if you're more bothered about having a 'just in case' product thats going to be sat in the bottom of your rucksack lots.
Hope that helps a little
Richard Talbot - Product Manager - Mountain Equipment