Thanks for your input Cj. I looked on the web and concensus defitinely that the ceramics dont flow as well. Also depends on the density of the metallic matrix. There seems to be some disagreement as to which holds up to heat the best. Was hoping to have some more input from the folks on here.
I know that SZ used to use ceramic but now they are using metallic. Greg really didnt have a whole lot of specifics on the ones they are using (in fact he originally said they were using ceramic and then wrote back and said they had switched to metallic).