In reply to Theo Moore:
The Instinct last is wide around the front of the foot and the toes. They aren't particularly wide around the heel.
The Instinct is the only performance shoe I have ever found (and I've tried a lot!) that doesn't pinch my toes together if I get the length right. I have tried lots of other shoes that, while too narrow at the front of my foot, are baggy around my heel no matter how much I downsize. Even the other Scarpa models that are still wideish like the Booster, Boostic, Furia, Drago all pinch.
What has always surprised me if the number of people who claim to fit La Sportiva, Five Ten and Tenaya who also claim the Instinct VS is a good fit for them. The Instincts fit me like a glove but Sportiva, Five Ten and Tenaya will leave me in agony after a couple of problems.