California Sunroof - Questsion from newbie

[Scoot]

Hi -

I'm considering purchasing a car that has the California sunroof. Having previously owned a Mercedes hatchback with the Panoramic sunroof, and a $2000+ repair bill when it failed, I'm being cautious and asking questions first...

1. Is the Cali sunroof subject to expensive maintenance, replacement, failure?

2. Is the car louder than other non-sunroof or "standard" sunroof cars when the Cali roof is closed?

3. What is the headroom cost with the Cali roof as compared with no sunroof and standard sunroof?

Anything else I should be wondering about the Cali sunroof?

thanks!
Scott