I was thinking that maybe the crank, derailleurs, and remote lock combo were probably worth the $300.00 but I sort of overlooked the IsoZone. Is that 20mm of travel in the back really going to make a noticeable difference? Or is that the sort of thing where after a mile or two it's not much, but after 40 miles when your tired and trying to push it out then you appreciate it a lot more?