Are smart fitness mirrors worth it compared to a tablet on a stand?

Reviewers are divided. PCMag and Coach call mirrors like the Echelon Reflect attractive and motivating because you can see your form while the class plays, which a tablet can't do. But Garage Gym Reviews and r/homegym threads consistently argue that for users who don't need form-checking, a tablet plus an app delivers most of the value at a fraction of the price.