The Good The TCL S325 series is one of the least expensive smart TVs you can buy. Roku TV delivers the best smart TV experience on the market, with a simple, responsive user interface, thousands of apps and constant feature upgrades. The Bad It has a worse picture than Vizio’s E-Series TVs — but those are only available at 43 inches and up. The Bottom Line If you want an affordable TV smaller than 50 inches, the TCL S325 series Roku TV should be one of your first choices. The trend in TVs today is bigger and bigger screen sizes, and I’m the first reviewer to tell you get a larger TV. For years my TV buying guide has included the following line: “Bigger is better: More than any other ‘feature,’ stepping up in TV screen size is the best use of your money.” But what if money is tight? What if you can’t fit a 55-inch TV in that spot? What if a 32- or 40-inch TV — positively puny by today’s standards — is plenty? If that’s the case for you, start with the TCL S325 series, reviewed here along with its larger brother the S425.  Let’s get one thing out of the way first: Their picture quality is mediocre. They ...