Here's my 2 cents after having it installed recently on my Z with Kenwood DNX6140.
I've set it so that the settings mirror the original settings with the original head unit.
There is some lag when you want to change radio stations. About 1 sec before it updates.
Changing Sources also takes about a second.
Volume is a bit quicker than the two, but it's not as quick as the stock setup.
I'd say overall, it does the job, and can be improved upon.
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