The extra features of the Voyage are:
- Reinforced glass screen which gives better contrast than the plastic screen of the PW.
- Metal, rather than plastic, body.
- Flush screen rather than recessed.
- Considerably smaller size than the PW.
- Haptic page turn sensors.
- Light sensor to automatally adjust the light level.
Only you can decide whether or not these features justify the extra cost of the Voyage. I think they do, but you may reach a different conclusion.