It's a law of physics that all things being equal, a thicker head will stay in motion (resonate) for a longer amount of time than a thinner head. I used clear G1's over clear G1's for a long time.(G1's are a 10 mil single ply head) A fine sound, no doubt. As an experiment I tried clear Diplomats, a thinner head, (7.5 mils) as resos. I thought it would make for a livelier tom. I got noticeably less sustain that the G1 over G1 combo. So I went back to the G1's as resos. I tried the clear G plus's (a single ply 12 mil head) as batters and lost the attack I like. Instead of my toms sounding like "doom doom" they sounded like "oom oom" to me. So I went back to the G1 batter. Months later I wanted to experiment again, because I felt my 10" DW tom wasn't sustaining enough. Since I had a set of barely used G plus's laying around I decided to try them as resos. I immediately heard more warmth and sustain from my drums, right in keeping with the law of physics. This does go counter with what Evans claims, but I know what I hear and that's what matters most. I trust my ears and sensibilities over another mans marketing hype any day. Evans make fine heads, not knocking them, I use them, but experiments convinced me that G pluses sustain longer and sound better as resos than the G1's. Now, the EC1's are a 14 mil single ply head, even thicker that the G Plus'. This should make for and even longer sustain. I do have a set of them that I peeled the overtone control rings off of with the help of a blowdryer...(I'll control my overtones thank you very much) but I haven't experimented with them yet. Haven't tried the 2 ply EC2 heads as reso's either, but I will probably experiment with them as well. Meantime, I am very happy and satisfied with the sound of clear G1's over clear G Plus. Next experiment is with the EC1's, I'll make a post when I do.