I have a sheet of it and I've just been cutting up small chunks (just over 1cm each). It's not easy to cut and will blunt your scissors, but it's possible.
I'm interested by how well it would work to increase airiness, or whether it would hold too much water in that circumstance.
Anyway I have 12 keikis of a Den. I had 3 last year in S/H but I've dried them out since taking the other 9 and had them in plain leca. I've just put two of them into a mixture of moss and ecoweb cubes, I'm going to put another two in plain moss and leave the rest in Leca and see which do best, and I'll try and note how wet the ecoweb mixture is staying compared to the plain moss ones. They are all only in small pots, but some small pieces of this same den (additional to the 12 keikis, pieces I didn't expect to survive in the first place) were staying too wet in plain moss even with 5 of them in one pot. However they were also growing well, and I now want to try the larger keikis wetter than the leca but drier than the plain moss.
Here are some pics as I was potting it just now. We shall see if it works or not