Compared to the M64 Pro, the shape of the M68 Pro is a little less daring. Shared between both is the unusually low front, in turn resulting in a steeper sloping down towards the front than on competing designs. The hump itself actually isn't too pronounced or tapered, and positioned slightly towards the rear. Of particular note is the base width of the M68 Pro. Neither the front nor back flare out much, which has the width be almost the same across the entire length. Another unique trait is the way the main buttons are shaped. Not only framed by ledges, the main buttons also have comfort grooves that increasingly get deeper towards the front, resulting in their outer edges ending up more elevated than the middle portion. In addition, the main button pieces have been elongated to account for most hand sizes. Overall, yet another shape that takes some getting used to, but doing interesting things not necessarily shared by other designs.
As for grip styles, I'd say the M68 Pro mostly suits palm and claw grip. It is a medium-sized mouse with a moderately pronounced hump, which should make it generally suit medium-sized to large hands. For reference, my hands are 19 cm long and 10 cm wide, and I found the M68 Pro comfortable in claw grip.
Dimensions
This table includes the dimensions of the CHERRY XTRFY M68 Pro and several other ambidextrous mice. "Front height" denotes the distance between the base and main buttons. Measurements with two decimals have been taken with a caliper, while those with one decimal have been taken with a ruler. For a full list of all measurements taken, please refer to this sheet compiled by an esteemed community member.
CHERRY XTRFY M68 Pro Dimensions
M68 Pro
M8 Wireless
UltralightX
Viper V3 Hyperspeed
Pro X Superlight 2
Base Length
12.0 cm
11.5 cm
11.0 cm
11.5 cm
11.3 cm
Length (including overhang)
12.34 cm
11.78 cm
12.10 cm
12.69 cm
12.5 cm
Front Height (lowest point)
0.5 cm
0.4 cm
1.1 cm
1.1 cm
1.2 cm
Height (highest point)
3.85 cm
3.75 cm
3.60 cm
3.91 cm
3.91 cm
Front Width (widest point)
6.11 cm
5.79 cm
5.88 cm
6.23 cm
6.08 cm
Back Width (widest point)
6.27 cm
5.93 cm
6.16 cm
6.37 cm
6.27 cm
Grip Width (narrowest point)
5.96 cm
5.66 cm
5.66 cm
5.99 cm
5.90 cm
Below are some comparison shots with each of the measured mice: