I recently tested my newly purchased Zephyros 1 during several nights on Dartmoor in temperatures hovering around -3c and wind between 20 and 25mph. The Zephyros performed superbly (although, as with any single hoop design it can be quite rattly - ear plugs take care of that). I also replaced the supplied v pegs (I bent three on my first practice pitch) with titanium y-pegs and changed to cam cleats for the guys, which make getting a taught pitch (and a quieter night) much easier (total cost less than £20). That said, this "budget" tent performed beyond expectation and I had no difficulty with space despite being 6'2".
Two tips - a) removing the end poles (easy) makes packing much simpler and reduces packed size and
b) I found I got a better pitch by slackening the straps between the inner tent and fly before pitching and then tensioning to suit thereafter.
Overall, an excellent tent at a very affordable price. Well done Wild Country.