Although the Quantum M-series isn't new this year, the 50" is. The less expensive model doesn't have the features the Q-M-50 does. I believe its the only 50" class (49.5") that utilizes the Quantum technology. It is supposed to be superior with better blacks and a little deeper colors with a fast refresh. I caught this model on sale which helped make my decision. It does have wall mounts however I use a console table. Independent reviews might reveal other features of the Quantum technology that help explain the differences.