With any ball type valve, you have to remember they are quite restrictive over open holes. And that little bit can be a pain in the Butt sometimes.
On my UDS with three (3) 3/4" capped intakes and one (1) upright 24" tube ball valve, I definitely miss a temperature range between the fully open ball valve with no caps off...and the ball valve completely closed and one cap off.
My UDS wants to run an ideal low & slow 225-250ish grate temp somewhere between the single open ball valve and/or a single open capped intake. Therefore I'm always playing with the intakes and can't let it go either way for more than an hour.