Not much to improve upon
I have had these for 2 years. Returned a similar pair of La Sportivas (I love La Sportiva boots btw) due to poor fit and not so sticky rubber.
I used these for trail runs, casual mtn bike rides, grade III climbs, and wet wading. I just threw them in the trash because of the stink and disintegrated cardboard last. Amazing shoes. My only gripe is that sand and scree tends to get trapped within the liner material and trickles it's way out. The sole on one heal just started to delam...not bad for the amount of use.
I'm about to buy another pair...1/2 size up this time to keep my toes from hitting the front on long downhills.