I've own some 2005 Ultrasensors, and tried on but didn't buy the 2005 Attack short because of the shorter inseam and the thinner fabric. I was wearing light-colored underwear when I tried on the Attack shorts, and could see them through the shorts. The Ultrasensor fabric is somewhat heavier and more supportive so I like it better.
The chamois on the 2005 Ultrasensors is substantial, but doesn't bunch up at all on me. I don't need shorts this thick for when I ride my mountain bike, but the seat on my road bike seems harder (it's a Selle Italia Gel Flow) and that's when they come in handy. I've worn those Ultrasensors on rides ranging from 30 to 66 miles and they've come through very nicely.
Has anyone tried PI's new chamois? I'm curious to know what it's like. I didn't buy last year's Sugar Knickers because the rise was too short and the chamois seemed too thin, but I might be interested in the 2006 model if the chamois has been improved.
~Carissa