• less snug fit for the phone (scratches)
• less force required to mount on the HAMA-equipment
• instead of HAMA 5.8mm screws can be used (more rigid laptop-holders or camera mini-tripods)
• thinner base-plate
• overhang on lower side of HAMA-mount less steep
• thicker back-plate
• less stringing

improvements in V3:

• cross-supports on the back
• less snug fit of the phone (better but not yet perfect)
• allow third-party plugs that are wider then the default-one
• less snug fit on the HAMA-connector
• can also mount on camera-equipment (1/4")

improvements in V4:

• hole to access the power-button
• hole to keep your stylus

improvements in V5:

• allow even wider USB-plugs
• holes between the cross-supports in the back against warping and to save material

• print
• mount on any HAMA-compatible or camera-compatible suction-cub/tripod/screw-on/...
• insert phone with keyboard extended
• optional: use cable to attach power and car-stereo/headphones or even external monitor