In Ryanair we have the "open IC" solution which in my mind is the perfect solution. Combined with an ANR headset you feel less exhausted after work. The Sennheiser HMEC 45 KA (the one with flat earpieces) is a pretty good deal only problem is that after 5 days, 30-40 hours of wearing it, my ears feel sore. Also, changing batteries once a week is a drawback.
But the ANR function works perfectly, it's very lightweight, comfortable and also quite small.
I'd give it a 9 out of 10.
Anyone care to share their experience/compare Sennheiser v Telex...