Rab Mythic Ultra 360?

Anyone out there with some experience with this bag? It looks promising and light for most 3 season adventures, and not super claustrophobic either with a 63" shoulder girth (same as my current bag which feels perfect for me).

https://rab.equipment/ca/mythic-ultra-360-down-sleeping-bag?srsltid=AfmBOorHxife4r3JOyXCoccl9Y0Hn-k-FS3IAHmsQxERn5CtVjgLN7lr

Alternatively I'm also looking at the Myhic 400 (limit -6C) or Mythic 600 (limit -12C) for a slightly more affordable option.