Got a 7 inch Milwaukee in 2005 primarily for the extended reach over a 4.5. Gets into deeper corners/cuts deeper than the smaller diameter wheels.. That said, I make a mental note to concentrate hard when using the thing. The starting torque is significant (compared to the smaller ones) and if the optional hand grip is not attached, thing want to twist in your hands. Everything else is also magnified, so if it binds and kickbacks, it pays to be on your toes. If you like running these with the guards removed, pay particular attention.
Thing has some heft to it, will build up your forearms with repetitive use. Any position other than horizontal is a workout, at least for this old guy. I use it, but not nearly as often as I thought when purchased.