No, I have not tried them but another blog site mentioned them when I was learning/reading about pipes. I think it is Fe.Ro the company started by Federico Rovera. They have limited availability in the US and if I recall correctly the discussion was split some like them and some had them split and crack. Here is the link to the main site for what it is worth: http://www.fero-usa.com/index.html
You might try googling Fr.Ro to find the dicussion if you want as well.
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You might try googling Fr.Ro to find the dicussion if you want as well.