have you thought about Starrett also? I have one of their adjustable 6" I use all the time on the jointer mainly and then during the projects if needed.
I have the milwaukee 4" as well, however mine is now true lol .. I do have some of the bigger woodpecker squares that I use so maybe I am partial to them.
If I was you, I would more than likely be looking hard into the 6/8 combo ... more chances to use them over the bigger 12, or the even bigger 18/24 ones or whatever those sizes are ... just my thoughts
I will say I have never used the igaging so I cant comment on quality or anything.