I wear a resin copy of the TPM/AOTC OWK saber with my OWK Clone Wars costume. I did have a problem where the Covertec came out of the saber, but I fixed it and so far that has held through several hours of wear. I paid about $60 for it which is much less than the $525 for the MR Elite Edition TPM or the ~$800 that the MR AOTC sabers go for now.
When I get around to doing a Dooku, I hope to find a resin or something similar because I don't want to use my $800 MR.
Now, if I was doing a static photo shoot, I would use the MR; but if I'm walking around and might be running into things or have people running into me, I will wear something else.
BTW, I think there may be legal repercussion from re-casting an MR saber.