Those on the new £50m. ferry's journey from Poole to Guernsey and the evening sailing from Guernsey to Poole said they were worried about the welfare of fellow passengers. Some have even taken to a popular Facebook page to ask if everyone was all right after the journeys.
Condor has, however, defended its decision to sail, saying conditions remained within permissible limits.
Max Carling, the founder of Ship and Fly who quit the business in 2012, was a passenger on the Liberation's midday sailing from Poole to Guernsey.
'If the experience had been at night, even the most experienced of travellers would have been alarmed,' he said.
'I was concerned for the welfare of the people on-board, particularly the young, infirm and the elderly. I can only hope the powers-that-be at Condor inspect whether this is right for our waters.'
Mr Carling said the ferry, after leaving around 20 minutes late, was travelling in what he believed to be waves of less than two metres high.
'This thing was corkscrewing around the ocean like there was no tomorrow.'