Kit, the Uratex foam is for dampening... not diffusion. I have their foam between my walls just to minimize outside noise. My problem is slapback. I was looking at some Auralex stuff in the US... kinda bulky to bring in.
I'm also not too fond of the pyramid pattern. As per my understanding, the dark grey foam I'm looking for (like in the photo with the ||E ||E pattern) also acts as mini traps for higher frequencies aside from diffusing them.
I've padded a few problem spots and it has helped, but Uratex acoustic foam is flat and closed cell foam, so surface is smooth and does generate SOME reverb. It's not like packing foam.
**Another note, guys and gals... please don't just stick packing sponge foam on your walls. These usually aren't fire rated and WILL go up in a flash and emit highly toxic fumes.**
Uratex makes acoustic foam usually for building insulation and echo control... but not to studio specs. It'll do for now... but I'm really after the padding I posted above.