Regret is too strong a word but the Cali is certainly more complicated which worries me a bit, and, to the annoyance of my wife it doesn't have a roof level shelf. In our T4 I took out the roof bed which was in two parts leaving a 3ft deep shelf at the back , ideal for storing junk, wash kits, rain wear etc.
BUT the Cai is brilliant to drive, it's automatic, it's quieter, the internal table design is brilliant and you can open the cupboard doors with the table up. And the roof doesn't require a regular work out at the gym to be able to lowere it. And the blinds are better than the curtains. And the front window blinds can be stored flat on the upper bed for travel which is ace and , and,and, oh yes, the table in the door means we have to put only one extra table in the boot ( we're into tables when camping!).
So, on balance despite your perceptive comment I'm pleased we've got the Cali.
David