I had one, didn't like it much though, I prefer the standard Rapha gilet or the pt rain gilet (both of which I own), these are more structured than the brevet one.
Is 'structured' a more coded way of saying 'substantial'? Brevet looks like it's pretty flimsy in the pics, pt rain looks like it's got the hardshell coating?
I would say yes, it is flimsy compared with others, it does its job as a very packable emergency layer but I would never choose it to take on a ride if I had other options. The PT Lightweight Gilet is also a nice, very packable item, not really any stock left though now.
I had one, didn't like it much though, I prefer the standard Rapha gilet or the pt rain gilet (both of which I own), these are more structured than the brevet one.