These Mag Genius magnetic tile sets look to have appeared on Amazon in September, but they are new to me, and what value! The Mag Genius 185-piece set with 17 Click-ins is only $99.95 with free Prime/SuperSaver shipping. The smaller Mag Genius sets seem to be priced very well too. According to the reader questions, these are compatible with Magna Tiles and Picasso Tiles and comparable magnetic tiles sets. These sets got 4.5 out of 5 stars over 31 customer reviews (87% of the reviews were 5 stars).
Assuming they get good reviews and all other things being equal, the best way to judge value in magnetic tile sets is the price per tile. In this set (ignoring the click-ins), the price per tile is 54 cents. Compare that to say, this 100-piece Picasso Tiles set for $69.99 or 70 cents per tile, or this 60-piece Magnetic Stick 'N Stack set for $39,99 or 67 cents per tile. The Mag Genius set is a really excellent value over other popular sets.