I was looking at Magna tiles pricing, and I suddenly see that there are other brands out there. The one I'm familiar with are the clear ones called Magna Tiles. But there is a Magna Tiles solid color, Picasso Tiles, and Metro Mags. The other name brands are a bit cheaper. Does anyone have them? Does anyone have both Magna Tiles and another brand? If so, how do they compare? Can you use them together?