Cauliflowers - time to mature?

I've had success with Candid Charm and White Step. The ones I can really recommend are Maystar. I know they are growing for a year, and at the end of a year the plants look pretty wrecked, but they have always given me solid, tasty caulies. My main complaint with cauliflowers is no matter how I try to stagger them they all try to be ready together.
The ones that are always a failure for me are All the year round.