I have it and don't like it because it's way too long on me- I'm 5'4" and had to take it to a leather shop to have it cut and re-sewed even on the shortest hole. The ones for $285 (I have 3 of them, Azur, Ebene, and Mono) are slightly narrower and more adjustable. Perfect fit and very well made.
If you are taller than me, then the 305 will work for you. I am very particular about where my bags hit me on the hip. With the three others I have, I can get the exact shoulder length.
Great to know! Thanks!