Secondly, in a lot of the pictures of these things, it looks like you can see the individual LEDs behind the diffusion material. Is this just due to decreasing the exposure of the picture, so that everything isn't blown out, or can you actually see the individual LEDs when they are on?
I guess I will opt for the SparkFun matrices, based on what I've read here, and elsewhere, provided I can still get them (backorder?).
Wow, I cannot believe the price on those R/G units, basically $1.29 each! For that kind of price, they would be fun to play around with. Are you making your own drivers, I presume?