Don't know if I've had a recent update on my Vizio smart set or not, but it has always seemed like it took TOO long to be able to switch inputs! That's a simple function that should be quickly available. 32" set from about two years ago. Can't remember what series it is. I also can't pair the vizio remote to the vizio anymore, it's strictly infrared lately. Don't know why.
Given what I've experienced in connectivity, and limited apps, my next TV, if possible will not be a "smart" set. I much prefer to use an add-on box which can easily be upgraded by replacement. I find myself using ROKU more than the apps in the Vizio. My two vizios don't hold connectivity, even on "excellent" signal. One has roku wired to router, so no big deal. The other one is atop a refrigerator, 20 feet from a router and drops connections, ignores connections, and is very quirky. (24" smart set.)
I like the PICTURE and PRICE of the Vizios, but the "smart" part...."Meh."