I just installed 6 new work halo ICAT cans in my existing ceiling this weekend. Lots of fun up there in the 16" of FG insulation. I like the new work cans and always choose halo.
Trouble is that these cans are not air-tight at all. Maybe I'll seal them up.
Looks much much better than the old t8 fixtures. Placing the cans is very important. Half the lumens but properly placed, spaced, makes much more "light". Spend lots of time thinking about locations.
Oh and a coffee can lid, plastic from folgers, is exactly 6-3/8" which makes it the perfect template for the cutouts if you don't own the 50$ dedicated hole saw.