The 4021 is $170 at Costco and the 4221 is $250 at Bestbuy. Other than a 2" difference in length, a different remote and Wifi bluetooth capability, there appears to be little difference between the two, especially in terms of performance. Any thoughts on whether it makes sense ot spend the extra money on the 4221?
Unless you can't live without hearing music from your smart phone or pad, get the one from Costco it's 60 bucks under the Vizio's list price, and the one at BB is right at list price. Anything from Sam's and Costco is a better deal then BB, and without the experts.