I have several, and I like them.
As far as breaking in and smoking, do as you would with a briar.
I let a thin cake develop, just as with a briar. Morta is
mineralized Oak. Comparisons to Meerschaum are ridiculous and misguided. Meerschaum is a mineral and hence won't burn (not pipe temperatures, anyway) whereas Morta, which is wood, will. Now, on the other hand, fossilized wood, which is more of a mineral, due to the processes (extreme heat and pressure) and time spent in the ground (millions of years), is much less likely to burn, probably even if you took a cutting torch to it...
Morta, Oak, which is a hardwood is more susceptible to charring than briar, in my opinion, so having a cake there to provide some insulation is beneficial. I base this on my own limited personal experience, not years of methodological double blind testing, so take it for what it's worth.
FWIW, here's an article that describes burning bog oak (Morta)
Bog Oak
I think I have enough disclaimers in here so as not to get flamed further down the thread...