My LBS loaned me an Escape shifter when mine was waiting for replacement springs. I didn't like it, probably because I'm used to the multiple shifts, and I like the definite clicks of the 2006 mechanism. Compact cranks with a wide range cog, like 12-25, need to shift 2 or 3 gears in the back when slowing down and shifting to the 34 chainring. It's nice to do it with one push of each thumb.

But, in the drops, I sometimes shift twice when I only wanted one gear. It's harder to use just the right thumb pressure from the drops. So with a single shift modification, when the pros are sprinting to the finish, they could mash the thumb lever hard, without getting two shifts.