Rodderick, I'm at 43N latitude and only use screens during the Summer and Fall season. My climate may be of little value to your situation, but I thought I would chime in.
Michael Bush, a prominent enthusiast and researcher in the States, uses them year round at 41N. However, we can have polar blasts of 0 to -20 degree F for weeks during January and February, which is not the case in his locality. When using them one winter, I had 100% loss, and will not repeat this strategy.
I feel their advantages out-weigh their disadvantages, as long as they can be swapped out for the appropriate season.