As I am trying to move out of Blood Angels (see my thread in Swap Shop or Pm me, no business on discussion forums

) I have collected quite a bit of Ultramarines. Currently for UM I have a predator, vindicator, 3
dev
squads, and 2 tactical squads. Earlier, I was scrolling through Battle Scribe and was attracted to this formation. Here's how it (should) go if I get all the models:
Core:
Tech marine + 2x Predators and a Vindicator
Command:
Sergeant Chronus
Auxiliary:
Mechanized Infantry #1: Tactical squad 10 man
Mechanized Infantry #2: Same thing as above
Mechanized Infantry #3-5: Devastator squads
Are there any perks for this formation? As you can see what I have, what should I change around? Looking for helpful feed back to help start a new army!