I am really conflicted about Pivot bikes. Having owned a Titus Switchblade, I really want to like any bike that Chris Cocalis creates with Pivot. That said, I have never fully felt comfortable on a Pivot bike and the Mach 6 is no exception.
Climbing - 3 stars
With a focus on descending and heavier weight than many of the other bikes tested today, the Mach 6 was a solid climber, but by no means the best. The Mach 6's additional weight no doubt affects it climbing performance.
Descending - 5 stars
At least the Mach 6 is consistent in its performance. Descending feel was super solid and predictable, yet still fun.
Cornering - 4 stars
The Mach 6 is steady and predictable in cornering, if lacking a bit in liveliness.
Summary: The Mach 6 is a great descending bike at the expense of some climbing ability. It's baby brother, the Mach 5.7, is a super climber, but doesn't feel completely settled going downhill. Combining the best of these two bikes in one bike would make a killer bike, but other bikes that I rode today (namely the Devinci Troy and the Transition Patrol) actually get close to this ideal.
5 stars - Absolutely outstanding
3 stars - Solid performance, meets expectations
1 star - Misses expectations by a wide margin