For an A/T tire, they are fairly quiet (obviously not like a highway tire). The ride is relatively smooth on road as well. Definitely a good option for a mostly on-road daily driver. I run the Falken Wildpeaks on my 4Runner for over 50k. I've been very impressed with the Falken products.
I've been very happy with mine as well after 1700 miles now. I went with the OEM size and got the XL load range version as I tow frequently. Like you said they aren't quiet, however, they aren't any louder than my KO2's were on the 4Runner. It helps that the GX is so quiet to begin with. I never actually drove with the OEM tires as they were swapped out before I took delivery.