I just talked to PBM about their timing chains and the rep told me that they had a few issues with their EID chains(not sure what EID means) so they upgraded to Rolon chains.
He said they had been using the EID's for 15 years prior with no issues but within the last two years issues had been occuring so they switched to Rolon a year ago.
Here's a link with a little info:
http://www.jp.com.au/Chain.html