I had the Giro Pneumo for 4 years until its retaining system broke. It always was vaguely uncomfortable, and the split right at the center of my forehead seemed to pinch me. In fact, no matter how tight or loose I made it, it seemed to give me a big red dot (or even lump) right at the top of my forehead.
I just replaced it with the Bell Sweep R, and I find it to be MUCH more comfortable!! Like it loads better. The only issue I have with it is I'm currently trying to find a helmet-mounted taillight to fit it, and can't seem to find one that spans the available vent holes. I think I've come up with a jury-rigged solution that will work, tho.