I'm sorry you had that happen to your bag. I returned mine due to the screw issue, but I miss that bag!!!! I've been tempted to try it again but I worry about the glazing issue.
I have the Delightful azure and mono in the MM and also the speedy b 30. Both are awesome bags!! I don't think I could pick between the two. Of course with DE, you don't have to worry about weather. It depends on if you prefer hobos or satchels. Good luck!
I know I would miss it too once I return it!! I think they told me the screw issue has been fix on new bags. Glazing is the issue now. Since it is a pretty pink it gets easily dirty and the edges where the angles meet is kinda awarkward that it's prone to chipping.
Btw, since you own the Delightful do you feel it lighter than the Caissa bag? I noticed that I only have a small agenda and mini pochette inside and already the bag feels heavy already on my shoulders. I think it's because of the folds and the hardware.