I got the Cal King.  Like a bunch of other people, I had to cut 2 inches off the top of the metal posts for this to be the right height for our bed.  This seems like a common problem, so I hope the manufacturer takes note.  I don't think our bed is unusually low.  In fact, it's a bit higher than average.  Luckily our neighbor has a circular saw and cut it for us.

Pros: great quality, esp for price.  sufficient cushion
Cons: metal posts need to be cut for an average/above average height bed.