I prefer the jacket style. Full zip (doesn't mess with the hair do (I know I'm vain). I wouldnt worry about any loss of waterproofing with the full length zip. The OMM stuff all seems to have this really cool zip design going on anyway that protects the zip opening. I got the OMM Kamleika Race Pants too, got a good deal from these chaps: http://www.aboveandbeyond.co.uk/OMM/list/f4. For me the OMM kit is like Ronseal, it does exactly what it says on the tin plus more in my experience.